#!/bin/bash
trap 'Clean; exit' INT TERM EXIT
if [[ $1 != 'NoColor' ]]; then
    Color_R=$(tput setaf 9)
    Color_G=$(tput setaf 10)
    Color_B=$(tput setaf 12)
    Color_Y=$(tput setaf 11)
    Color_N=$(tput sgr0)
fi

function Clean {
    rm -rf iP*/ shsh/ tmp/ ${UniqueChipID}_${ProductType}_*.shsh2 ${UniqueChipID}_${ProductType}_${HWModel}ap_*.shsh *.im4p *.bbfw BuildManifest.plist
}

function Echo {
    echo "${Color_B}$1 ${Color_N}"
}

function Error {
    echo -e "\n${Color_R}[Error] $1 ${Color_N}"
    [[ ! -z $2 ]] && echo "${Color_R}* $2 ${Color_N}"
    echo
    exit
}

function Input {
    echo "${Color_Y}[Input] $1 ${Color_N}"
}

function Log {
    echo "${Color_G}[Log] $1 ${Color_N}"
}

function Main {
    clear
    Echo "******* iOS-OTA-Downgrader *******"
    Echo "   Downgrader script by LukeZGD   "
    echo
    
    if [[ $OSTYPE == "linux-gnu" ]]; then
        . /etc/os-release 2>/dev/null
        platform="linux"
        bspatch="bspatch"
        ideviceenterrecovery="ideviceenterrecovery"
        ideviceinfo="ideviceinfo"
        idevicerestore="sudo LD_LIBRARY_PATH=resources/lib resources/tools/idevicerestore_linux"
        iproxy="iproxy"
        ipsw="env LD_LIBRARY_PATH=lib tools/ipsw_linux"
        irecoverychk="resources/libirecovery/bin/irecovery"
        irecovery="sudo LD_LIBRARY_PATH=resources/lib $irecoverychk"
        partialzip="resources/tools/partialzip_linux"
        pwnedDFU="sudo LD_LIBRARY_PATH=resources/lib resources/tools/pwnedDFU_linux"
        python="python2"
        futurerestore1="sudo LD_PRELOAD=resources/lib/libcurl.so.3 LD_LIBRARY_PATH=resources/lib resources/tools/futurerestore1_linux"
        futurerestore2="sudo LD_LIBRARY_PATH=resources/lib resources/tools/futurerestore2_linux"
        tsschecker="env LD_LIBRARY_PATH=resources/lib resources/tools/tsschecker_linux"
        if [[ $UBUNTU_CODENAME == "bionic" ]]; then
            futurerestore2="${futurerestore2}_bionic"
            idevicerestore="${idevicerestore}_bionic"
        elif [[ $UBUNTU_CODENAME == "xenial" ]]; then
            futurerestore2="${futurerestore2}_xenial"
            idevicerestore="${idevicerestore}_xenial"
            partialzip="${partialzip}_xenial"
            tsschecker="${tsschecker}_xenial"
        fi

    elif [[ $OSTYPE == "darwin"* ]]; then
        macver=${1:-$(sw_vers -productVersion)}
        platform="macos"
        bspatch="resources/tools/bspatch_$platform"
        ideviceenterrecovery="resources/libimobiledevice_$platform/ideviceenterrecovery"
        ideviceinfo="resources/libimobiledevice_$platform/ideviceinfo"
        idevicerestore="resources/tools/idevicerestore_$platform"
        iproxy="resources/libimobiledevice_$platform/iproxy"
        ipsw="tools/ipsw_$platform"
        irecovery="resources/libimobiledevice_$platform/irecovery"
        irecoverychk=$irecovery
        partialzip="resources/tools/partialzip_$platform"
        pwnedDFU="resources/tools/pwnedDFU_$platform"
        python="python"
        futurerestore1="resources/tools/futurerestore1_$platform"
        futurerestore2="resources/tools/futurerestore2_$platform"
        tsschecker="resources/tools/tsschecker_$platform"
    fi
    
    [[ ! -d resources ]] && Error "resources folder cannot be found. Replace resources folder and try again" "If resources folder is present try removing spaces from path/folder name"
    [[ ! $platform ]] && Error "Platform unknown/not supported."
    chmod +x resources/tools/*
    [ $? == 1 ] && Log "An error occurred in chmod. This might cause problems..."
    [[ ! $(ping -c1 8.8.8.8 2>/dev/null) ]] && Error "Please check your Internet connection before proceeding."
    [[ $(uname -m) != 'x86_64' ]] && Error "Only x86_64 distributions are supported. Use a 64-bit distro and try again"
    
    if [[ $1 == Install ]] || [ ! $(which $irecoverychk) ] || [ ! $(which $ideviceinfo) ] ||
       [ ! $(which git) ] || [ ! $(which $bspatch) ] || [ ! $(which $python) ]; then
        cd resources
        rm -rf firmware ipwndfu libimobiledevice_$platform libirecovery
        cd ..
        InstallDependencies
    fi
    
    SaveExternal iOS-OTA-Downgrader-Keys
    SaveExternal ipwndfu
    
    Log "Finding device in normal mode..."
    ideviceinfo2=$($ideviceinfo -s)
    if [[ $? != 0 ]]; then
        Log "Finding device in DFU/recovery mode..."
        irecovery2=$($irecovery -q 2>/dev/null | grep 'MODE' | cut -c 7-)
    fi
    [[ $irecovery2 == "DFU" ]] && DFUDevice=1
    [[ $irecovery2 == "Recovery" ]] && RecoveryDevice=1
    
    if [[ $DFUDevice == 1 ]] || [[ $RecoveryDevice == 1 ]]; then
        ProductType=$($irecovery -q | grep 'PTYP' | cut -c 7-)
        [ ! $ProductType ] && read -p "[Input] Enter ProductType (eg. iPad2,1): " ProductType
        UniqueChipID=$((16#$(echo $($irecovery -q | grep 'ECID' | cut -c 7-) | cut -c 3-)))
        ProductVer='Unknown'
    else
        ProductType=$(echo "$ideviceinfo2" | grep 'ProductType' | cut -c 14-)
        [ ! $ProductType ] && ProductType=$($ideviceinfo | grep 'ProductType' | cut -c 14-)
        ProductVer=$(echo "$ideviceinfo2" | grep 'ProductVer' | cut -c 17-)
        VersionDetect=$(echo $ProductVer | cut -c 1)
        UniqueChipID=$(echo "$ideviceinfo2" | grep 'UniqueChipID' | cut -c 15-)
        UniqueDeviceID=$(echo "$ideviceinfo2" | grep 'UniqueDeviceID' | cut -c 17-)
    fi
    [ ! $ProductType ] && ProductType=0
    BasebandDetect
    Clean
    mkdir tmp
    
    Echo "* Platform: $platform $macver"
    Echo "* HardwareModel: ${HWModel}ap"
    Echo "* ProductType: $ProductType"
    Echo "* ProductVersion: $ProductVer"
    Echo "* UniqueChipID (ECID): $UniqueChipID"
    echo
    
    if [[ $DFUDevice == 1 ]] && [[ $A7Device != 1 ]]; then
        DFUManual=1
        Mode='Downgrade'
        Log "32-bit device in DFU mode detected."
        Echo "* Advanced options menu - use at your own risk"
        Echo "* Warning: A6 devices won't have activation error workaround yet when using this method"
        Input "This device is in:"
        select opt in "kDFU mode" "DFU mode (ipwndfu A6)" "pwnDFU mode (checkm8 A5)" "(Any other key to exit)"; do
            case $opt in
                "kDFU mode" ) break;;
                "DFU mode (ipwndfu A6)" ) CheckM8; break;;
                "pwnDFU mode (checkm8 A5)" ) kDFU iBSS; break;;
                * ) exit;;
            esac
        done
        Log "Downgrading $ProductType in kDFU/pwnDFU mode..."
        SelectVersion
    elif [[ $RecoveryDevice == 1 ]] && [[ $A7Device != 1 ]]; then
        read -p "$(Input 'Is this an A6 device in recovery mode? (y/N) ')" DFUManual
        if [[ $DFUManual == y ]] || [[ $DFUManual == Y ]]; then
            Recovery
        else
            Error "32-bit device detected in recovery mode. Please put the device in normal mode and jailbroken before proceeding" "For usage of 32-bit ipwndfu, put the device in Recovery/DFU mode (A6) or pwnDFU mode (A5 using Arduino)"
        fi
    fi
    
    if [[ $1 ]] && [[ $1 != 'NoColor' ]]; then
        Mode="$1"
    else
        Selection=("Downgrade device")
        [[ $A7Device != 1 ]] && Selection+=("Save OTA blobs" "Just put device in kDFU mode")
        Selection+=("(Re-)Install Dependencies" "(Any other key to exit)")
        Echo "*** Main Menu ***"
        Input "Select an option:"
        select opt in "${Selection[@]}"; do
            case $opt in
                "Downgrade device" ) Mode='Downgrade'; break;;
                "Save OTA blobs" ) Mode='SaveOTABlobs'; break;;
                "Just put device in kDFU mode" ) Mode='kDFU'; break;;
                "(Re-)Install Dependencies" ) InstallDependencies;;
                * ) exit;;
            esac
        done
    fi
    SelectVersion
}

function SelectVersion {
    if [[ $ProductType == iPad4* ]] || [[ $ProductType == iPhone6* ]]; then
        OSVer='10.3.3'
        BuildVer='14G60'
        Action
    elif [[ $Mode == 'kDFU' ]]; then
        Action
    fi
    Selection=("iOS 8.4.1")
    if [ $ProductType == iPad2,1 ] || [ $ProductType == iPad2,2 ] ||
       [ $ProductType == iPad2,3 ] || [ $ProductType == iPhone4,1 ]; then
        Selection+=("iOS 6.1.3")
    fi
    [[ $Mode == 'Downgrade' ]] && Selection+=("Other")
    Selection+=("(Any other key to exit)")
    Input "Select iOS version:"
    select opt in "${Selection[@]}"; do
        case $opt in
            "iOS 8.4.1" ) OSVer='8.4.1'; BuildVer='12H321'; break;;
            "iOS 6.1.3" ) OSVer='6.1.3'; BuildVer='10B329'; break;;
            "Other" ) OSVer='Other'; break;;
            *) exit;;
        esac
    done
    Action
}

function Action {
    Log "Option: $Mode"
    if [[ $OSVer == 'Other' ]]; then
        Echo "* Move/copy the IPSW and SHSH to the directory where the script is located"
        Echo "* Remember to create a backup of the SHSH"
        read -p "$(Input 'Path to IPSW (drag IPSW to terminal window): ')" IPSW
        IPSW="$(basename $IPSW .ipsw)"
        read -p "$(Input 'Path to SHSH (drag SHSH to terminal window): ')" SHSH
        
    elif [[ $Mode == 'Downgrade' ]] && [[ $A7Device != 1 ]]; then
        read -p "$(Input 'Jailbreak the selected iOS version? (y/N): ')" Jailbreak
        [[ $Jailbreak == y ]] || [[ $Jailbreak == Y ]] && Jailbreak=1
        
    elif [[ $A7Device == 1 ]] && [[ $pwnDFUDevice != 0 ]]; then
        [[ $DFUDevice == 1 ]] && CheckM8 || Recovery
    fi
    
    if [[ $Mode == 'Downgrade' ]] && [[ $ProductType == iPhone5,1 ]] && [[ $Jailbreak != 1 ]]; then
        Echo "By default, iOS-OTA-Downgrader now flashes the iOS 8.4.1 baseband to iPhone5,1"
        Echo "Flashing the latest baseband is still available as an option but beware of problems it may cause"
        Echo "There are potential network issues that with the latest baseband when used on iOS 8.4.1"
        read -p "$(Input 'Flash the latest baseband? (y/N) (press ENTER when unsure): ')" Baseband5
        if [[ $Baseband5 == y ]] || [[ $Baseband5 == Y ]]; then
            Baseband5=0
        else
            BasebandURL=$(cat $Firmware/12H321/url)
            Baseband=Mav5-8.02.00.Release.bbfw
            BasebandSHA1=db71823841ffab5bb41341576e7adaaeceddef1c
        fi
    fi
    
    [[ $Mode == 'Downgrade' ]] && Downgrade
    [[ $Mode == 'SaveOTABlobs' ]] && SaveOTABlobs
    [[ $Mode == 'kDFU' ]] && kDFU
    exit
}

function SaveOTABlobs {
    Log "Saving $OSVer blobs with tsschecker..."
    BuildManifest="resources/manifests/BuildManifest_${ProductType}_${OSVer}.plist"
    if [[ $A7Device == 1 ]]; then
        APNonce=$($irecovery -q | grep 'NONC' | cut -c 7-)
        Echo "* APNonce: $APNonce"
        $tsschecker -d $ProductType -B ${HWModel}ap -i $OSVer -e $UniqueChipID -m $BuildManifest --apnonce $APNonce -o -s
        SHSHChk=${UniqueChipID}_${ProductType}_${HWModel}ap_${OSVer}-${BuildVer}_${APNonce}.shsh
    else
        $tsschecker -d $ProductType -i $OSVer -e $UniqueChipID -m $BuildManifest -o -s
        SHSHChk=${UniqueChipID}_${ProductType}_${OSVer}-${BuildVer}_*.shsh2
    fi
    SHSH=$(ls $SHSHChk)
    [ ! $SHSH ] && Error "Saving $OSVer blobs failed. Please run the script again" "It is also possible that $OSVer for $ProductType is no longer signed"
    mkdir -p saved/shsh 2>/dev/null
    [[ ! $(ls saved/shsh/$SHSHChk 2>/dev/null) ]] && cp "$SHSH" saved/shsh
    Log "Successfully saved $OSVer blobs."
}

function kDFU {
    if [ ! -e saved/$ProductType/$iBSS.dfu ]; then
        Log "Downloading iBSS..."
        $partialzip $(cat $Firmware/$iBSSBuildVer/url) Firmware/dfu/$iBSS.dfu $iBSS.dfu
        mkdir -p saved/$ProductType 2>/dev/null
        mv $iBSS.dfu saved/$ProductType
    fi
    [[ ! -e saved/$ProductType/$iBSS.dfu ]] && Error "Failed to save iBSS. Please run the script again"
    Log "Patching iBSS..."
    $bspatch saved/$ProductType/$iBSS.dfu tmp/pwnediBSS resources/patches/$iBSS.patch
    
    if [[ $1 == iBSS ]]; then
        cd resources/ipwndfu
        Log "Booting iBSS..."
        sudo $python ipwndfu -l ../../tmp/pwnediBSS
        ret=$?
        cd ../..
        return $ret
    fi
    
    [[ $VersionDetect == 1 ]] && kloader='kloader_hgsp'
    [[ $VersionDetect == 5 ]] && kloader='kloader5'
    [[ ! $kloader ]] && kloader='kloader'
    
    [ ! $(which $iproxy) ] && Error "iproxy cannot be found. Please re-install dependencies and try again" "./restore.sh Install"
    $iproxy 2222 22 &
    iproxyPID=$!
    WifiAddr=$(echo "$ideviceinfo2" | grep 'WiFiAddress' | cut -c 14-)
    WifiAddrDecr=$(echo $(printf "%x\n" $(expr $(printf "%d\n" 0x$(echo "${WifiAddr}" | tr -d ':')) - 1)) | sed 's/\(..\)/\1:/g;s/:$//')
    echo '#!/bin/sh' > tmp/pwn.sh
    echo "/usr/sbin/nvram wifiaddr=$WifiAddrDecr" >> tmp/pwn.sh
    chmod +x tmp/pwn.sh
    
    Log "Copying stuff to device via SSH..."
    Echo "* Make sure OpenSSH/Dropbear is installed on the device!"
    Echo "* Enter root password of your iOS device when prompted, default is 'alpine'"
    scp -P 2222 resources/tools/$kloader tmp/pwnediBSS tmp/pwn.sh root@127.0.0.1:/
    [ $? == 1 ] && Error "Cannot connect to device via SSH. Please check your ~/.ssh/known_hosts file and try again" "You may also run: rm ~/.ssh/known_hosts"
    Log "Entering kDFU mode..."
    if [[ $VersionDetect == 1 ]]; then
        ssh -p 2222 root@127.0.0.1 "/pwn.sh; /$kloader /pwnediBSS" &
    else
        ssh -p 2222 root@127.0.0.1 "/$kloader /pwnediBSS" &
    fi
    echo
    Echo "* Press POWER or HOME button when screen goes black on the device"
    Log "Finding device in DFU mode..."
    while [[ $DFUDevice != 1 ]]; do
        [[ $platform == linux ]] && DFUDevice=$(lsusb | grep -c '1227')
        [[ $platform == macos ]] && [[ $($irecovery -q 2>/dev/null | grep 'MODE' | cut -c 7-) == "DFU" ]] && DFUDevice=1
        sleep 1
    done
    Log "Found device in DFU mode."
    kill $iproxyPID
}

function Recovery {
    [[ $($irecovery -q 2>/dev/null | grep 'MODE' | cut -c 7-) == "Recovery" ]] && RecoveryDevice=1
    if [[ $RecoveryDevice != 1 ]]; then
        Log "Entering recovery mode..."
        $ideviceenterrecovery $UniqueDeviceID >/dev/null
        while [[ $RecoveryDevice != 1 ]]; do
            [[ $($irecovery -q 2>/dev/null | grep 'MODE' | cut -c 7-) == "Recovery" ]] && RecoveryDevice=1
        done
    fi
    Log "Device in recovery mode detected. Get ready to enter DFU mode"
    read -p "$(Input 'Select Y to continue, N to exit recovery (Y/n) ')" RecoveryDFU
    if [[ $RecoveryDFU == n ]] || [[ $RecoveryDFU == N ]]; then
        Log "Exiting recovery mode."
        $irecovery -n
        exit
    fi
    Echo "* Hold POWER and HOME button for 8 seconds."
    for i in {08..01}; do
        echo -n "$i "
        sleep 1
    done
    echo -e "\n$(Echo '* Release POWER and hold HOME button for 8 seconds.')"
    for i in {08..01}; do
        echo -n "$i "
        sleep 1
    done
    sleep 2
    [[ $($irecovery -q 2>/dev/null | grep 'MODE' | cut -c 7-) == "DFU" ]] && DFUDevice=1
    [[ $DFUDevice == 1 ]] && CheckM8
    Error "Failed to detect device in DFU mode. Please run the script again"
}

function CheckM8 {
    DFUManual=1
    [[ $A7Device == 1 ]] && echo -e "\n$(Log 'Device in DFU mode detected.')"
    if [[ $platform == macos ]]; then
        Selection=("iPwnder32" "ipwndfu")
        Input "Select pwnDFU tool to use (press ENTER when unsure):"
        select opt in "${Selection[@]}"; do
            case $opt in
                "ipwndfu" ) pwnDFUTool="ipwndfu"; break;;
                "iPwnder32" ) pwnDFUTool="iPwnder32"; break;;
                *) pwnDFUTool="${Selection[0]}"; break;;
            esac
        done
    else
        pwnDFUTool="ipwndfu"
    fi
    Log "Entering pwnDFU mode with $pwnDFUTool..."
    if [[ $pwnDFUTool == "ipwndfu" ]]; then
        cd resources/ipwndfu
        sudo $python ipwndfu -p
        pwnDFUDevice=$?
    elif [[ $pwnDFUTool == "iPwnder32" ]]; then
        $pwnedDFU -p -f
        pwnDFUDevice=$?
        cd resources/ipwndfu
    fi    
    if [[ $pwnDFUDevice == 0 ]]; then
        Log "Device in pwnDFU mode detected."
        if [[ $A7Device == 1 ]]; then
            Log "Running rmsigchks.py..."
            sudo $python rmsigchks.py
            cd ../..
        else
            cd ../..
            kDFU iBSS
        fi
        Log "Downgrading device $ProductType in pwnDFU mode..."
        Mode='Downgrade'
        SelectVersion
    else
        Error "Failed to enter pwnDFU mode. Please run the script again" "./restore.sh Downgrade"
    fi    
}

function Downgrade {    
    if [[ $OSVer != 'Other' ]]; then
        [[ $ProductType == iPad4* ]] && IPSWType="iPad_64bit"
        [[ $ProductType == iPhone6* ]] && IPSWType="iPhone_4.0_64bit"
        [[ ! $IPSWType ]] && IPSWType="$ProductType" && SaveOTABlobs
        IPSW="${IPSWType}_${OSVer}_${BuildVer}_Restore"
        IPSWCustom="${IPSWType}_${OSVer}_${BuildVer}_Custom"
        if [ ! -e $IPSW.ipsw ] && [ ! -e $IPSWCustom.ipsw ]; then
            Log "iOS $OSVer IPSW cannot be found."
            Echo "* If you already downloaded the IPSW, did you put it in the same directory as the script?"
            Echo "* Do NOT rename the IPSW as the script will fail to detect it"
            Log "Downloading IPSW... (Press Ctrl+C to cancel)"
            curl -L $(cat $Firmware/$BuildVer/url) -o tmp/$IPSW.ipsw
            mv tmp/$IPSW.ipsw .
        fi
        if [ ! -e $IPSWCustom.ipsw ]; then
            Log "Verifying IPSW..."
            IPSWSHA1=$(cat $Firmware/$BuildVer/sha1sum)
            IPSWSHA1L=$(shasum $IPSW.ipsw | awk '{print $1}')
            [[ $IPSWSHA1L != $IPSWSHA1 ]] && Error "Verifying IPSW failed. Delete/replace the IPSW and run the script again"
        else
            IPSW=$IPSWCustom
        fi
        if [ ! $DFUManual ] && [[ $iBSSBuildVer == $BuildVer ]]; then
            Log "Extracting iBSS from IPSW..."
            mkdir -p saved/$ProductType 2>/dev/null
            unzip -o -j $IPSW.ipsw Firmware/dfu/$iBSS.dfu -d saved/$ProductType
        fi
    fi
    
    [ ! $DFUManual ] && kDFU
    
    # uses ipsw tool from OdysseusOTA/2 to create custom IPSW with jailbreak
    if [[ $Jailbreak == 1 ]]; then
        if [[ $OSVer == 8.4.1 ]]; then
            JBFiles=(fstab.tar etasonJB-untether.tar Cydia8.tar)
            JBSHA1=6459dbcbfe871056e6244d23b33c9b99aaeca970
            JBS=2305
        else
            JBFiles=(fstab_rw.tar p0sixspwn.tar Cydia6.tar)
            JBSHA1=1d5a351016d2546aa9558bc86ce39186054dc281
            JBS=1260
        fi
        if [[ ! -e resources/jailbreak/${JBFiles[2]} ]]; then
            cd tmp
            Log "Downloading jailbreak files..."
            SaveFile https://github.com/LukeZGD/iOS-OTA-Downgrader-Keys/releases/download/jailbreak/${JBFiles[2]} ${JBFiles[2]} $JBSHA1
            cp ${JBFiles[2]} ../resources/jailbreak
            cd ..
        fi
        for i in {0..2}; do
            JBFiles[$i]=jailbreak/${JBFiles[$i]}
        done
        if [ ! -e $IPSWCustom.ipsw ]; then
            Echo "* By default, memory option is set to Y, you may select N later if you encounter problems"
            Echo "* If it doesn't work with both, you might not have enough RAM or tmp storage"
            read -p "$(Input 'Memory option? (press ENTER if unsure) (Y/n): ')" JBMemory
            [[ $JBMemory != n ]] && [[ $JBMemory != N ]] && JBMemory="-memory" || JBMemory=
            Log "Preparing custom IPSW..."
            cd resources
            ln -sf firmware/FirmwareBundles FirmwareBundles
            $ipsw ../$IPSW.ipsw ../$IPSWCustom.ipsw $JBMemory -bbupdate -s $JBS ${JBFiles[@]}
            cd ..
        fi
        [ ! -e $IPSWCustom.ipsw ] && Error "Failed to find custom IPSW. Please run the script again" "You may try selecting N for memory option"
        IPSW=$IPSWCustom
    fi
    
    Log "Extracting IPSW..."
    unzip -q $IPSW.ipsw -d $IPSW/
    
    # create custom IPSW for 10.3.3
    if [[ $A7Device == 1 ]]; then
        if [ ! -e $IPSWCustom.ipsw ]; then
            Log "Preparing custom IPSW..."
            cp $IPSW/Firmware/all_flash/$SEP .
            $bspatch $IPSW/Firmware/dfu/$iBSS.im4p $iBSS.im4p resources/patches/$iBSS.patch
            $bspatch $IPSW/Firmware/dfu/$iBEC.im4p $iBEC.im4p resources/patches/$iBEC.patch
            if [[ $ProductType == iPad4* ]]; then
                $bspatch $IPSW/Firmware/dfu/$iBSSb.im4p $iBSSb.im4p resources/patches/$iBSSb.patch
                $bspatch $IPSW/Firmware/dfu/$iBECb.im4p $iBECb.im4p resources/patches/$iBECb.patch
                cp -f $iBSSb.im4p $iBECb.im4p $IPSW/Firmware/dfu
            fi
            cp -f $iBSS.im4p $iBEC.im4p $IPSW/Firmware/dfu
            cd $IPSW
            zip ../$IPSWCustom.ipsw -rq0 *
            cd ..
            mv $IPSW $IPSWCustom
            IPSW=$IPSWCustom
        else
            cp $IPSW/Firmware/dfu/$iBSS.im4p $IPSW/Firmware/dfu/$iBEC.im4p .
            [[ $ProductType == iPad4* ]] && cp $IPSW/Firmware/dfu/$iBSSb.im4p $IPSW/Firmware/dfu/$iBECb.im4p .
            cp $IPSW/Firmware/all_flash/$SEP .
        fi
        [ ! -e $IPSW.ipsw ] && Error "Failed to create custom IPSW. Please run the script again"
        if [[ $ProductType == iPad4,4 ]] || [[ $ProductType == iPad4,5 ]]; then
            iBEC=$iBECb
            iBSS=$iBSSb
        fi
        Log "Entering pwnREC mode..."
        $irecovery -f $iBSS.im4p
        $irecovery -f $iBEC.im4p
        sleep 5
        [[ $($irecovery -q 2>/dev/null | grep 'MODE' | cut -c 7-) == "Recovery" ]] && RecoveryDevice=1
        if [[ $RecoveryDevice != 1 ]]; then
            echo -e "\n$(Log 'Failed to detect device in pwnREC mode.')"
            Echo "* If you device has backlight turned on, you may try re-plugging in your device and attempt to continue"
            Input "Press ENTER to continue anyway (or press Ctrl+C to cancel)"
            read -s
        else
            Log "Found device in pwnREC mode."
        fi
        SaveOTABlobs
    fi
    
    if [[ $Jailbreak != 1 ]] && [[ $A7Device != 1 ]] && [[ $OSVer != 'Other' ]]; then
        Log "Preparing for futurerestore... (Enter root password of your PC/Mac when prompted)"
        cd resources
        sudo bash -c "$python -m SimpleHTTPServer 80 &"
        cd ..
    fi
    
    if [[ $Jailbreak == 1 ]]; then
        Log "Proceeding to idevicerestore..."
        mkdir shsh
        mv $SHSH shsh/${UniqueChipID}-${ProductType}-${OSVer}.shsh
        $idevicerestore -y -e -w $IPSW.ipsw
    elif [ $Baseband == 0 ]; then
        Log "Device $ProductType has no baseband"
        Log "Proceeding to futurerestore..."
        if [[ $A7Device == 1 ]]; then
            $futurerestore2 -t $SHSH -s $SEP -m $BuildManifest --no-baseband $IPSW.ipsw
        else
            $futurerestore1 -t $SHSH --no-baseband --use-pwndfu $IPSW.ipsw
        fi
    else
        if [[ $A7Device == 1 ]]; then
            cp $IPSW/Firmware/$Baseband .
        elif [ $ProductType == iPhone5,1 ] && [[ $Baseband5 != 0 ]]; then
            [ ! -e saved/$ProductType/$Baseband ] && unzip -o -j $IPSW.ipsw Firmware/$Baseband -d saved/$ProductType
            cp saved/$ProductType/$Baseband .
            cp $BuildManifest BuildManifest.plist
        elif [ ! -e saved/$ProductType/$Baseband ]; then
            Log "Downloading baseband..."
            $partialzip $BasebandURL Firmware/$Baseband $Baseband
            $partialzip $BasebandURL BuildManifest.plist BuildManifest.plist
            mkdir -p saved/$ProductType 2>/dev/null
            cp $Baseband BuildManifest.plist saved/$ProductType
        else
            cp saved/$ProductType/$Baseband saved/$ProductType/BuildManifest.plist .
        fi
        BasebandSHA1L=$(shasum $Baseband | awk '{print $1}')
        Log "Proceeding to futurerestore..."
        if [ ! -e *.bbfw ] || [[ $BasebandSHA1L != $BasebandSHA1 ]]; then
            rm -f saved/$ProductType/*.bbfw saved/$ProductType/BuildManifest.plist
            Log "Downloading/verifying baseband failed."
            Echo "* Your device is still in kDFU mode and you may run the script again"
            Echo "* You can also continue and futurerestore can attempt to download the baseband again"
            Input "Press ENTER to continue (or press Ctrl+C to cancel)"
            read -s
            $futurerestore1 -t $SHSH --latest-baseband --use-pwndfu $IPSW.ipsw
        elif [[ $A7Device == 1 ]]; then
            $futurerestore2 -t $SHSH -s $SEP -m $BuildManifest -b $Baseband -p $BuildManifest $IPSW.ipsw
        else
            $futurerestore1 -t $SHSH -b $Baseband -p BuildManifest.plist --use-pwndfu $IPSW.ipsw
        fi
    fi
    
    echo
    Log "Restoring done!"
    if [[ $Jailbreak != 1 ]] && [[ $A7Device != 1 ]] && [[ $OSVer != 'Other' ]]; then
        Log "Stopping local server... (Enter root password of your PC/Mac when prompted)"
        ps aux | awk '/python/ {print "sudo kill -9 "$2" 2>/dev/null"}' | bash
    fi
    Log "Downgrade script done!"
}

function InstallDependencies {
    mkdir tmp 2>/dev/null
    cd tmp
    
    Log "Installing dependencies..."
    if [[ $ID == "arch" ]] || [[ $ID_LIKE == "arch" ]]; then
        # Arch
        sudo pacman -Sy --noconfirm --needed base-devel bsdiff curl libcurl-compat libpng12 libimobiledevice libusbmuxd libzip openssh openssl-1.0 python2 unzip usbmuxd usbutils
        ln -sf /usr/lib/libcurl.so.3 ../resources/lib/libcurl.so.3
        ln -sf /usr/lib/libzip.so.5 ../resources/lib/libzip.so.4
    
    elif [[ $ID == "opensuse-tumbleweed" ]]; then
        #openSUSE Tumbleweed
        sudo zypper -n install automake bsdiff gcc git-core imobiledevice-tools libimobiledevice libpng12-0 libopenssl1_0_0 libusb-1_0-devel libusbmuxd-tools libtool make python-base readline-devel
        ln -sf /usr/lib64/libimobiledevice.so.6 ../resources/lib/libimobiledevice-1.0.so.6
        ln -sf /usr/lib64/libplist.so.3 ../resources/lib/libplist-2.0.so.3
        ln -sf /usr/lib64/libusbmuxd.so.6 ../resources/lib/libusbmuxd-2.0.so.6
    
    elif [[ $UBUNTU_CODENAME == "xenial" ]] || [[ $UBUNTU_CODENAME == "bionic" ]] ||
         [[ $UBUNTU_CODENAME == "focal" ]] || [[ $UBUNTU_CODENAME == "groovy" ]]; then
        # Ubuntu
        sudo add-apt-repository universe
        sudo apt update
        sudo apt install -y autoconf automake bsdiff build-essential checkinstall curl git libglib2.0-dev libimobiledevice-utils libreadline-dev libtool-bin libusb-1.0-0-dev libusbmuxd-tools openssh-client usbmuxd usbutils
        
        SavePkg
        cp libcurl.so.4.5.0 ../resources/lib/libcurl.so.3
        if [[ $UBUNTU_CODENAME == "bionic" ]]; then
            sudo apt install -y libzip4 python
            sudo dpkg -i libpng12_bionic.deb libzip5.deb
            SaveFile https://github.com/LukeZGD/iOS-OTA-Downgrader-Keys/releases/download/tools/tools_linux_bionic.zip tools_linux_bionic.zip 959abbafacfdaddf87dd07683127da1dab6c835f
            unzip tools_linux_bionic.zip -d ../resources/tools
        elif [[ $UBUNTU_CODENAME == "xenial" ]]; then
            sudo apt install -y libzip4 python libpng12-0
            SaveFile https://github.com/LukeZGD/iOS-OTA-Downgrader-Keys/releases/download/tools/tools_linux_xenial.zip tools_linux_xenial.zip b74861fd87511a92e36e27bf2ec3e1e83b6e8200
            unzip tools_linux_xenial.zip -d ../resources/tools
        else
            sudo apt install -y libzip5 python2
            sudo dpkg -i libpng12.deb libssl1.0.0.deb libzip4.deb
        fi
        if [[ $UBUNTU_CODENAME == "focal" ]]; then
            ln -sf /usr/lib/x86_64-linux-gnu/libimobiledevice.so.6 ../resources/lib/libimobiledevice-1.0.so.6
            ln -sf /usr/lib/x86_64-linux-gnu/libplist.so.3 ../resources/lib/libplist-2.0.so.3
            ln -sf /usr/lib/x86_64-linux-gnu/libusbmuxd.so.6 ../resources/lib/libusbmuxd-2.0.so.6
        fi
        
    elif [[ $ID == "fedora" ]]; then
        # Fedora
        sudo dnf install -y automake binutils bsdiff git libimobiledevice-utils libpng12 libtool libusb-devel libusbmuxd-utils make libzip perl-Digest-SHA python2 readline-devel
        SavePkg
        ar x libssl1.0.0.deb data.tar.xz
        tar xf data.tar.xz
        cp usr/lib/x86_64-linux-gnu/libcrypto.so.1.0.0 usr/lib/x86_64-linux-gnu/libssl.so.1.0.0 ../resources/lib
        if (( $VERSION_ID <= 32 )); then
            ln -sf /usr/lib64/libimobiledevice.so.6 ../resources/lib/libimobiledevice-1.0.so.6
            ln -sf /usr/lib64/libplist.so.3 ../resources/lib/libplist-2.0.so.3
            ln -sf /usr/lib64/libusbmuxd.so.6 ../resources/lib/libusbmuxd-2.0.so.6
        fi
        ln -sf /usr/lib64/libzip.so.5 ../resources/lib/libzip.so.4
        ln -sf /usr/lib64/libbz2.so.1.* ../resources/lib/libbz2.so.1.0
    
    elif [[ $OSTYPE == "darwin"* ]]; then
        # macOS
        xcode-select --install
        SaveFile https://github.com/libimobiledevice-win32/imobiledevice-net/releases/download/v1.3.6/libimobiledevice.1.2.1-r1091-osx-x64.zip libimobiledevice.zip dba9ca5399e9ff7e39f0062d63753d1a0c749224
        Log "(Enter root password of your Mac when prompted)"
        sudo codesign --sign - --force --deep ../resources/tools/idevicerestore_macos
        
    else
        Error "Distro not detected/supported by the install script." "See the repo README for supported OS versions/distros"
    fi
    
    if [[ $platform == linux ]]; then
        Compile LukeZGD libirecovery
        ln -sf ../libirecovery/lib/libirecovery.so.3 ../resources/lib/libirecovery-1.0.so.3
        ln -sf ../libirecovery/lib/libirecovery.so.3 ../resources/lib/libirecovery.so.3
    else
        mkdir ../resources/libimobiledevice_$platform
        unzip libimobiledevice.zip -d ../resources/libimobiledevice_$platform
        chmod +x ../resources/libimobiledevice_$platform/*
    fi
    
    Log "Install script done! Please run the script again to proceed"
    exit
}

function Compile {
    git clone --depth 1 https://github.com/$1/$2.git
    cd $2
    ./autogen.sh --prefix="$(cd ../.. && pwd)/resources/$2"
    make install
    cd ..
    sudo rm -rf $2
}

function SaveExternal {
    ExternalURL="https://github.com/LukeZGD/$1.git"
    External=$1
    [[ $1 == "iOS-OTA-Downgrader-Keys" ]] && External="firmware"
    cd resources
    if [[ ! -d $External ]] || [[ ! -d $External/.git ]]; then
        Log "Downloading $External..."
        rm -rf $External
        git clone $ExternalURL $External
    #else
    #    Log "Updating $External..."
    #    cd $External
    #    git pull 2>/dev/null
    #    cd ..
    fi
    if [[ ! -e $External/README.md ]] || [[ ! -d $External/.git ]]; then
        rm -rf $External
        Error "Downloading/updating $1 failed. Please run the script again"
    fi
    cd ..
}

function SaveFile {
    curl -L $1 -o $2
    if [[ $(shasum $2 | awk '{print $1}') != $3 ]]; then
        Error "Verifying failed. Please run the script again" "./restore.sh Install"
    fi
}

function SavePkg {
    if [[ ! -d ../saved/pkg ]]; then
        Log "Downloading packages..."
        SaveFile https://github.com/LukeZGD/iOS-OTA-Downgrader-Keys/releases/download/tools/depends_linux.zip depends_linux.zip 7daf991e0e80647547f5ceb33007eae6c99707d2
        mkdir -p ../saved/pkg
        unzip depends_linux.zip -d ../saved/pkg
    fi
    cp ../saved/pkg/* .
}

function BasebandDetect {
    Firmware=resources/firmware/$ProductType
    BasebandURL=$(cat $Firmware/13G37/url 2>/dev/null) # iOS 9.3.6
    Baseband=0
    if [ $ProductType == iPad2,2 ]; then
        BasebandURL=$(cat $Firmware/13G36/url) # iOS 9.3.5
        Baseband=ICE3_04.12.09_BOOT_02.13.Release.bbfw
        BasebandSHA1=e6f54acc5d5652d39a0ef9af5589681df39e0aca
    elif [ $ProductType == iPad2,3 ]; then
        Baseband=Phoenix-3.6.03.Release.bbfw
        BasebandSHA1=8d4efb2214344ea8e7c9305392068ab0a7168ba4
    elif [ $ProductType == iPad2,6 ] || [ $ProductType == iPad2,7 ]; then
        Baseband=Mav5-11.80.00.Release.bbfw
        BasebandSHA1=aa52cf75b82fc686f94772e216008345b6a2a750
    elif [ $ProductType == iPad3,2 ] || [ $ProductType == iPad3,3 ]; then
        Baseband=Mav4-6.7.00.Release.bbfw
        BasebandSHA1=a5d6978ecead8d9c056250ad4622db4d6c71d15e
    elif [ $ProductType == iPhone4,1 ]; then
        Baseband=Trek-6.7.00.Release.bbfw
        BasebandSHA1=22a35425a3cdf8fa1458b5116cfb199448eecf49
    elif [ $ProductType == iPad3,5 ] || [ $ProductType == iPad3,6 ] ||
         [ $ProductType == iPhone5,1 ] || [ $ProductType == iPhone5,2 ]; then
        BasebandURL=$(cat $Firmware/14G61/url) # iOS 10.3.4
        Baseband=Mav5-11.80.00.Release.bbfw
        BasebandSHA1=8951cf09f16029c5c0533e951eb4c06609d0ba7f
    elif [ $ProductType == iPad4,2 ] || [ $ProductType == iPad4,3 ] || [ $ProductType == iPad4,5 ] ||
         [ $ProductType == iPhone6,1 ] || [ $ProductType == iPhone6,2 ]; then
        BasebandURL=$(cat $Firmware/14G60/url)
        Baseband=Mav7Mav8-7.60.00.Release.bbfw
        BasebandSHA1=f397724367f6bed459cf8f3d523553c13e8ae12c
        A7Device=1
    elif [ $ProductType == iPad4,1 ] || [ $ProductType == iPad4,4 ]; then
        A7Device=1
    elif [ $ProductType == 0 ]; then
        Error "No device detected. Please put the device in normal mode (and jailbroken for 32-bit) before proceeding" "Recovery or DFU mode is also applicable for A7 devices"
    elif [ $ProductType != iPad2,1 ] && [ $ProductType != iPad2,4 ] && [ $ProductType != iPad2,5 ] &&
         [ $ProductType != iPad3,1 ] && [ $ProductType != iPad3,4 ] && [ $ProductType != iPod5,1 ] &&
         [ $ProductType != iPhone5,3 ] && [ $ProductType != iPhone5,4 ]; then
        Error "Your device $ProductType is not supported."
    fi
    
    [ $ProductType == iPad2,1 ] && HWModel=k93
    [ $ProductType == iPad2,2 ] && HWModel=k94
    [ $ProductType == iPad2,3 ] && HWModel=k95
    [ $ProductType == iPad2,4 ] && HWModel=k93a
    [ $ProductType == iPad2,5 ] && HWModel=p105
    [ $ProductType == iPad2,6 ] && HWModel=p106
    [ $ProductType == iPad2,7 ] && HWModel=p107
    [ $ProductType == iPad3,1 ] && HWModel=j1
    [ $ProductType == iPad3,2 ] && HWModel=j2
    [ $ProductType == iPad3,3 ] && HWModel=j2a
    [ $ProductType == iPad3,4 ] && HWModel=p101
    [ $ProductType == iPad3,5 ] && HWModel=p102
    [ $ProductType == iPad3,6 ] && HWModel=p103
    [ $ProductType == iPad4,1 ] && HWModel=j71
    [ $ProductType == iPad4,2 ] && HWModel=j72
    [ $ProductType == iPad4,3 ] && HWModel=j73
    [ $ProductType == iPad4,4 ] && HWModel=j85
    [ $ProductType == iPad4,5 ] && HWModel=j86
    [ $ProductType == iPhone4,1 ] && HWModel=n94
    [ $ProductType == iPhone5,1 ] && HWModel=n41
    [ $ProductType == iPhone5,2 ] && HWModel=n42
    [ $ProductType == iPhone5,3 ] && HWModel=n48
    [ $ProductType == iPhone5,4 ] && HWModel=n49
    [ $ProductType == iPhone6,1 ] && HWModel=n51
    [ $ProductType == iPhone6,2 ] && HWModel=n53
    [ $ProductType == iPod5,1 ] && HWModel=n78
    
    if [ $ProductType == iPod5,1 ]; then
        iBSS="${HWModel}ap"
        iBSSBuildVer='10B329'
    elif [ $ProductType == iPad3,1 ]; then
        iBSS="${HWModel}ap"
        iBSSBuildVer='11D257'
    elif [ $ProductType == iPhone6,1 ] || [ $ProductType == iPhone6,2 ]; then
        iBSS="iphone6"
    elif [ $ProductType == iPad4,1 ] || [ $ProductType == iPad4,2 ] || [ $ProductType == iPad4,3 ] ||
         [ $ProductType == iPad4,4 ] || [ $ProductType == iPad4,5 ]; then
        iBSS="ipad4"
    else
        iBSS="$HWModel"
        iBSSBuildVer='12H321'
    fi
    iBEC="iBEC.$iBSS.RELEASE"
    iBECb="iBEC.${iBSS}b.RELEASE"
    iBSSb="iBSS.${iBSS}b.RELEASE"
    iBSS="iBSS.$iBSS.RELEASE"
    SEP="sep-firmware.$HWModel.RELEASE.im4p"
}

cd "$(dirname $0)"
Main $1