Legacy-iOS-Kit/README.md

# iOS-OTA-Downgrader
### Downgrade/restore and jailbreak iOS devices to signed OTA firmwares
- **Linux and macOS** are supported by this downgrade script/tool
  - Windows users can create a Linux live USB (see Requirements)
- iOS 8.4.1 and 6.1.3 downgrades have the option to **jailbreak** the install
  - For iOS 10.3.3, use [TotallyNotSpyware](https://totally-not.spyware.lol) to jailbreak
- **You do NOT need blobs to use this**, the script will get them for you
- This script can also restore your device to other iOS versions that you have SHSH blobs for (32-bit devices only, listed under Supported devices)
- **Please read the "Other notes" section for tips, frequent questions, and troubleshooting**

## Supported devices:

- You can identify your device [here](https://ipsw.me/device-finder)
- **iPhone 5C and iPad mini 3 devices are NOT supported** (OTA versions for them are not signed)
- iPhone 5C can still be restored to versions that you have SHSH blobs for

<table>
    <thead>
        <tr>
            <th>Target Version</th>
            <th>Supported Devices</th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td rowspan=4>iOS 10.3.3</td>
            <td><b>A7 devices:</b></td>
        </tr>
        <tr><td>iPhone 5S</td></tr>
        <tr><td>iPad Air 1</td></tr>
        <tr><td>iPad mini 2 (except iPad4,6)</td></tr>
        <tr>
            <td rowspan=6>iOS 8.4.1</td>
            <td><b>32-bit devices:</b></td>
        </tr>
        <tr><td>iPhone 4S</td></tr>
        <tr><td>iPhone 5</td></tr>
        <tr><td>iPad 2, iPad 3, iPad 4</td></tr>
        <tr><td>iPad mini 1</td></tr>
        <tr><td>iPod touch 5</td></tr>
        <tr>
            <td rowspan=2>iOS 6.1.3</td>
            <td>iPhone 4S</td>
        </tr>
        <tr><td>iPad 2 (except iPad2,4)</td></tr>
    </tbody>
</table>

## Requirements:
- **A supported device in any iOS version (listed above):**
  - A 32-bit device (**jailbreak needed**)
  - An A7 device (jailbreak not needed)
- An IPSW for the version you want to downgrade to
  - Links: [iOS 10.3.3](https://ipsw.me/10.3.3), [iOS 8.4.1](https://ipsw.me/8.4.1), [iOS 6.1.3](https://ipsw.me/6.1.3)
  - The script can also download it for you
- A **64-bit Linux install/live USB** or a supported **macOS** version
  - See supported OS versions and Linux distros below
  - A Linux live USB can be easily created with tools like [balenaEtcher](https://www.balena.io/etcher/) or [Rufus](https://rufus.ie/)
- Users with 32-bit devices must install [OpenSSH](https://cydia.saurik.com/package/openssh/)
  - Users in iOS 10 (A6/A6X) must also install Dropbear from my [Cydia repo](https://lukezgd.github.io/repo/)
  
<details>
  <summary>For Pangu 32-bit users:</summary>
  <ul><li>For 32-bit users using Pangu, install the latest untether for your iOS version <a href="https://github.com/LukeZGD/iOS-OTA-Downgrader-Keys/releases/tag/untether">here</a></li></ul>
</details>

## Usage:
1. [Download iOS-OTA-Downgrader here](https://github.com/LukeZGD/iOS-OTA-Downgrader/archive/master.zip) and extract the zip archive
2. Plug in your iOS device
3. Open a Terminal window
4. `cd` to where the zip archive is extracted, and run `./restore.sh`
    - You can also drag `restore.sh` to the Terminal window and press ENTER
5. Select options to be used
6. Follow instructions

## Supported OS versions/distros:
- **Ubuntu** [18.04](https://releases.ubuntu.com/bionic/), [20.04](https://releases.ubuntu.com/focal/), [20.10](https://releases.ubuntu.com/groovy/), [21.04](https://releases.ubuntu.com/hirsute/); and Ubuntu-based distros like [Linux Mint](https://www.linuxmint.com/)
- [**Arch Linux**](https://www.archlinux.org/) and Arch-based distros like [EndeavourOS](https://endeavouros.com/)
- [**Fedora** 32 to 34](https://getfedora.org/)
- [**Debian** Buster, Bullseye, Sid](https://www.debian.org/); and Debian-based distros like [MX Linux](https://mxlinux.org/)
- **openSUSE** [Tumbleweed](https://software.opensuse.org/distributions/tumbleweed), [Leap 15.2](https://software.opensuse.org/distributions/leap)
- **macOS** 10.12 to 11

## Other notes:
- **If something in the process does not work for you:** try unplugging/replugging the device, switching between different USB ports/cables, also try USB 2.0 ports
- **IPSW file integrity** will be verified before restoring and/or creating custom IPSW (if custom IPSW is already created, this will be skipped)
- **For users having issues with missing libraries/tools:** Re-install dependencies with `./restore.sh Install`
  - Alternatively, delete the `libimobiledevice` or `libirecovery` folder in `resources` then run the script again
- **For A7 devices:**
  - Do not use USB-C to lightning cables as this can prevent a successful restore
  - checkm8 ipwndfu is unfortunately pretty unreliable, you may have to try multiple times (for Linux users, also try in a live USB)
  - If the script cannot find your device in pwnREC mode or gets stuck, you may have to start over by hard-resetting and re-entering recovery/DFU mode
  - Use an Intel PC/Mac as entering pwnDFU (checkm8) may be a lot more unreliable on AMD devices
  - Other than the above, unfortunately there's not much else I can do to help regarding entering pwnDFU mode.
- **For 32-bit devices:**
  - To make sure that SSH is successful, try these steps: Reinstall OpenSSH/Dropbear, reboot and rejailbreak, then reinstall them again
  - To devices with baseband, this script will restore your device with the latest baseband (except when jailbreak is enabled, and on iPhone5,1 as there are reported issues)
  - This script can also be used to just enter kDFU mode for all supported devices
  - As alternatives to kloader/kDFU, checkm8 A5 or ipwndfu can also be used in DFU advanced menu
    - To enter DFU advanced menu, put your iOS device in DFU mode before running the script
  - This script can work on virtual machines, but I will not provide support for them
  - If you want to use other manually saved blobs for 6.1.3/8.4.1, create a folder named `saved`, then within it create another folder named `shsh`. You can then put your blob inside that folder.
    - The naming of the blob should be: `(ECID in Decimal)_(ProductType)_(Version)-(BuildVer).shsh(2)`
    - Example with path: `saved/shsh/123456789012_iPad2,1_8.4.1-12H321.shsh`
- **For the jailbreak option (iOS 6.1.3 and 8.4.1):**
  - If you have problems with Cydia, remove the ultrasn0w repo and close Cydia using the app switcher, then try opening Cydia again
  - If you cannot find Cydia in your home screen, try accessing Cydia through Safari with `cydia://` and install "Jailbreak App Icons Fix" package from my Cydia repo
- **For the jailbreak option (iOS 8.4.1 only):**
  - Stashing is already enabled and `nosuid` is removed from `fstab`, so no need to install "Stashing for #etasonJB" package
- **For users with A5 Rev A ([8942](https://www.theiphonewiki.com/wiki/S5L8942)) and A5X ([8945](https://www.theiphonewiki.com/wiki/S5L8945)) devices:**
  - **A5 Rev A devices:** iPad2,4, iPad mini 1, iPod touch 5
  - **A5X devices:** iPad 3
  - The jailbreak option **might not work** on A5 Rev A devices (see issue #70)
  - For users that downgraded **without** jailbreak option, and have manually jailbroken with the EtasonJB app, it is recommended to install "EtasonJB Disable Bootloop Protection" from my Cydia repo
  - For users that downgraded **with** the jailbreak option, and to users that have installed "EtasonJB Disable Bootloop Protection", your device might take a very long time to boot, possibly 20 minutes or more
- **My Cydia repo**: https://lukezgd.github.io/repo/ - for installing Dropbear, Jailbreak App Icons Fix, EtasonJB Disable Bootloop Protection

## Tools and other stuff used by this script:
- cURL
- bspatch
- [ipwndfu](https://github.com/LukeZGD/ipwndfu)
- [iPwnder32](https://github.com/dora2-iOS/iPwnder32)
- [irecovery](https://github.com/LukeZGD/libirecovery)
- [libimobiledevice](https://github.com/libimobiledevice/libimobiledevice)
- [imobiledevice-net](https://github.com/libimobiledevice-win32/imobiledevice-net) (macOS)
- [idevicerestore](https://github.com/LukeZGD/idevicerestore)
- ipsw tool from OdysseusOTA/2
- Python 2 (for ipwndfu, rmsigchks)
- [tsschecker](https://github.com/tihmstar/tsschecker)
- [futurerestore 152](http://api.tihmstar.net/builds/futurerestore/futurerestore-latest.zip) (32-bit)
- [futurerestore 251 (Linux)](https://github.com/LukeeGD/futurerestore) (A7)
- [futurerestore 245 (macOS)](https://github.com/MatthewPierson/Vieux/blob/master/resources/bin/futurerestore) (A7)
- [kloader](https://www.youtube.com/watch?v=fh0tB6fp0Sc)
- [kloader5 for iOS 5](https://mtmdev.org/pmbonneau-archive)
- [kloader_hgsp for iOS 10](https://twitter.com/nyan_satan/status/945203180522045440)
- [partial-zip](https://github.com/matteyeux/partial-zip)
- 32-bit iBSS patches are from [OdysseusOTA](https://www.youtube.com/watch?v=Wo7mGdMcjxw), [OdysseusOTA2](https://www.youtube.com/watch?v=fh0tB6fp0Sc), [alitek12](https://www.mediafire.com/folder/b1z64roy512wd/FirmwareBundles), [gjest](https://files.fm/u/fcbqqdnw)
- A7 iBSS and iBEC patches are from [MatthewPierson](https://github.com/MatthewPierson/iPhone-5s-OTA-Downgrade-Patches)