diff --git a/Cart_Reader/FLASH.ino b/Cart_Reader/FLASH.ino
index 083e941..e2f18a4 100644
--- a/Cart_Reader/FLASH.ino
+++ b/Cart_Reader/FLASH.ino
@@ -72,7 +72,7 @@ void flashMenu() {
     case 0:
       setupCFI();
       flashSize = 8388608;
-      writeCFI_Flash(0);
+      writeCFI_Flash(1, 1, 0);
       verifyFlash();
       print_STR(press_button_STR, 0);
       display_Update();
@@ -124,7 +124,7 @@ void flashMenu() {
     case 0:
       setupCFI();
       flashSize = 8388608;
-      writeCFI_Flash(0);
+      writeCFI_Flash(1, 1, 0);
       verifyFlash();
       print_STR(press_button_STR, 0);
       display_Update();
@@ -940,7 +940,7 @@ void writeByte_Flash(unsigned long myAddress, byte myData) {
     PORTL |= (1 << 6);
   }
   // for SNES LoRom repro with 2x 2MB
-  else if (mapping == 11) {
+  else if (mapping == 122) {
     // A8-A14
     PORTK = (myAddress >> 8) & 0x7F;
     // Set SNES A15(PK7) HIGH to disable SRAM
@@ -951,7 +951,7 @@ void writeByte_Flash(unsigned long myAddress, byte myData) {
     PORTL ^= (1 << 6);
   }
   // for SNES HiRom repro with 2x 2MB
-  else if (mapping == 22) {
+  else if (mapping == 222) {
     // A8-A15
     PORTK = (myAddress >> 8) & 0xFF;
     // A16-A23
@@ -962,7 +962,7 @@ void writeByte_Flash(unsigned long myAddress, byte myData) {
     PORTL |= (1 << 6);
   }
   // for SNES ExLoRom repro with 2x 4MB
-  else if (mapping == 111) {
+  else if (mapping == 124) {
     // A8-A14
     PORTK = (myAddress >> 8) & 0x7F;
     // Set SNES A15(PK7) HIGH to disable SRAM
@@ -972,8 +972,8 @@ void writeByte_Flash(unsigned long myAddress, byte myData) {
     // Flip A22(PL7) to reverse P0 and P1 roms
     PORTL ^= (1 << 7);
   }
-  // for SNES ExHiRom repro
-  else if (mapping == 222) {
+  // for SNES ExHiRom repro with 2x 4MB
+  else if (mapping == 224) {
     // A8-A15
     PORTK = (myAddress >> 8) & 0xFF;
     // A16-A22
@@ -989,6 +989,38 @@ void writeByte_Flash(unsigned long myAddress, byte myData) {
     // Switch SNES BA6(PL6) to HIGH to disable SRAM
     PORTL |= (1 << 6);
   }
+  // for SNES ExLoRom repro with 4x 2MB
+  else if (mapping == 142) {
+    // A8-A14
+    PORTK = (myAddress >> 8) & 0x7F;
+    // Set SNES A15(PK7) HIGH to disable SRAM
+    PORTK |= (1 << 7);
+    // A15-A22
+    PORTL = (myAddress >> 15) & 0xFF;
+    // Flip BA6(PL6) to address second rom chip
+    PORTL ^= (1 << 6);
+    // Flip A22(PL7) to reverse P0 and P1 roms
+    PORTL ^= (1 << 7);
+  }
+  // for SNES ExHiRom repro with 4x 2MB
+  else if (mapping == 242) {
+    // A8-A15
+    PORTK = (myAddress >> 8) & 0xFF;
+    // A16-A22
+    PORTL = (myAddress >> 16) & 0xFF;
+    // Flip BA5(PL5) to address second rom chip
+    PORTL ^= (1 << 5);
+    // Set PL7 to inverse of PL6 to reverse P0 and P1 roms
+    if (!(((myAddress >> 16) & 0xFF) & 0x40)) {
+      // if PL6 is 0 set PL7 to 1
+      PORTL |= (1 << 7);
+    } else if (((myAddress >> 16) & 0xFF) & 0x40) {
+      // if PL6 is 1 set PL7 to 0
+      PORTL &= ~(1 << 7);
+    }
+    // Switch SNES BA6(PL6) to HIGH to disable SRAM
+    PORTL |= (1 << 6);
+  }
 
   // Data
   PORTC = myData;
@@ -1055,7 +1087,7 @@ byte readByte_Flash(unsigned long myAddress) {
     PORTL |= (1 << 6);
   }
   // for SNES LoRom repro with 2x 2MB
-  else if (mapping == 11) {
+  else if (mapping == 122) {
     // A8-A14
     PORTK = (myAddress >> 8) & 0x7F;
     // Set SNES A15(PK7) HIGH to disable SRAM
@@ -1066,7 +1098,7 @@ byte readByte_Flash(unsigned long myAddress) {
     PORTL ^= (1 << 6);
   }
   // for SNES HiRom repro with 2x 2MB
-  else if (mapping == 22) {
+  else if (mapping == 222) {
     // A8-A15
     PORTK = (myAddress >> 8) & 0xFF;
     // A16-A23
@@ -1076,8 +1108,8 @@ byte readByte_Flash(unsigned long myAddress) {
     // Switch SNES BA6(PL6) to HIGH to disable SRAM
     PORTL |= (1 << 6);
   }
-  // for SNES ExLoRom repro
-  else if (mapping == 111) {
+  // for SNES ExLoRom repro with 2x 4MB
+  else if (mapping == 124) {
     // A8-A14
     PORTK = (myAddress >> 8) & 0x7F;
     // Set SNES A15(PK7) HIGH to disable SRAM
@@ -1087,8 +1119,8 @@ byte readByte_Flash(unsigned long myAddress) {
     // Flip A22(PL7) to reverse P0 and P1 roms
     PORTL ^= (1 << 7);
   }
-  // for SNES ExHiRom repro
-  else if (mapping == 222) {
+  // for SNES ExHiRom repro with 2x 4MB
+  else if (mapping == 224) {
     // A8-A15
     PORTK = (myAddress >> 8) & 0xFF;
     // A16-A22
@@ -1104,6 +1136,38 @@ byte readByte_Flash(unsigned long myAddress) {
     // Switch SNES BA6(PL6) to HIGH to disable SRAM
     PORTL |= (1 << 6);
   }
+  // for SNES ExLoRom repro with 4x 2MB
+  else if (mapping == 142) {
+    // A8-A14
+    PORTK = (myAddress >> 8) & 0x7F;
+    // Set SNES A15(PK7) HIGH to disable SRAM
+    PORTK |= (1 << 7);
+    // A15-A22
+    PORTL = (myAddress >> 15) & 0xFF;
+    // Flip BA6(PL6) to address second rom chip
+    PORTL ^= (1 << 6);
+    // Flip A22(PL7) to reverse P0 and P1 roms
+    PORTL ^= (1 << 7);
+  }
+  // for SNES ExHiRom repro with 4x 2MB
+  else if (mapping == 242) {
+    // A8-A15
+    PORTK = (myAddress >> 8) & 0xFF;
+    // A16-A22
+    PORTL = (myAddress >> 16) & 0xFF;
+    // Flip BA5(PL5) to address second rom chip
+    PORTL ^= (1 << 5);
+    // Set PL7 to inverse of PL6 to reverse P0 and P1 roms
+    if (!(((myAddress >> 16) & 0xFF) & 0x40)) {
+      // if PL6 is 0 set PL7 to 1
+      PORTL |= (1 << 7);
+    } else if (((myAddress >> 16) & 0xFF) & 0x40) {
+      // if PL6 is 1 set PL7 to 0
+      PORTL &= ~(1 << 7);
+    }
+    // Switch SNES BA6(PL6) to HIGH to disable SRAM
+    PORTL |= (1 << 6);
+  }
 
   // Arduino running at 16Mhz -> one nop = 62.5ns
   __asm__("nop\n\t"
@@ -1964,26 +2028,42 @@ void blankcheck_Flash() {
 }
 
 void verifyFlash() {
-  verifyFlash(0);
+  verifyFlash(1, 1, 0);
 }
 
-void verifyFlash(byte romChips) {
+void verifyFlash(byte currChip, byte totalChips, boolean reversed) {
   if (openVerifyFlashFile()) {
     blank = 0;
 
-    if (romChips == 1) {
-      myFile.seekCur(0);
-      // Truncate file to size of 1st flash chip
-      if (fileSize > flashSize / 2) {
-        fileSize = flashSize / 2;
-      }
-    } else if (romChips == 2) {
-      if (fileSize > flashSize / 2) {
-        myFile.seekCur(flashSize / 2);
-        fileSize = fileSize - (flashSize / 2);
-      } else
-        fileSize = 0;
-    }
+    if ((currChip == 1) && (totalChips == 4)) {
+      if (reversed)
+        myFile.seekSet(4194304);
+      fileSize = 2097152;
+    } else if ((currChip == 2) && (totalChips == 4) && (fileSize > 6291456)) {
+      if (reversed)
+        myFile.seekSet(6291456);
+      fileSize = 2097152;
+    } else if ((currChip == 3) && (totalChips == 4)) {
+      if (reversed)
+        myFile.seekSet(0);
+      fileSize = 2097152;
+    } else if ((currChip == 4) && (totalChips == 4)) {
+      if (reversed)
+        myFile.seekSet(2097152);
+      fileSize = 2097152;
+    } else if ((currChip == 1) && (totalChips == 2)) {
+      if (reversed)
+        myFile.seekSet(4194304);
+      fileSize = 4194304;
+    } else if ((currChip == 2) && (totalChips == 2)) {
+      if (reversed)
+        myFile.seekSet(0);
+      fileSize = 4194304;
+    } else if ((currChip == 1) && (totalChips == 1)) {
+      if (reversed)
+        myFile.seekSet(4194304);
+    } else
+      fileSize = 0;  // skip write
 
     //Initialize progress bar
     uint32_t processedProgressBar = 0;
@@ -1991,6 +2071,15 @@ void verifyFlash(byte romChips) {
     draw_progressbar(0, totalProgressBar);
 
     for (unsigned long currByte = 0; currByte < fileSize; currByte += 512) {
+      if ((reversed) && (currChip == 1) && (totalChips == 1) && (fileSize == 8388608) && (currByte == 4194304)) {
+        myFile.seekSet(0);
+      }
+      if ((reversed) && (currChip == 1) && (totalChips == 1) && (fileSize == 6291456) && (currByte == 2097152)) {
+        myFile.seekSet(0);
+        currByte = 4194304;
+        fileSize = 8388608;
+      }
+
       //fill sdBuffer
       myFile.read(sdBuffer, 512);
       for (int c = 0; c < 512; c++) {
@@ -2765,7 +2854,7 @@ void identifyCFI_Flash() {
 }
 
 // Write flashrom
-void writeCFI_Flash(byte romChips) {
+void writeCFI_Flash(byte currChip, byte totalChips, boolean reversed) {
   if (openFileOnSD()) {
     // Print filepath
     print_STR(flashing_file_STR, 0);
@@ -2807,29 +2896,41 @@ void writeCFI_Flash(byte romChips) {
     }
 
     print_Msg(F("Writing flash"));
-    // If we have two ROM chips only write half the ROM file here and skip to second half of file on second write
-    if (romChips == 0) {
-      println_Msg(F(""));
-    }
+    print_Msg(FS(FSTRING_SPACE));
+    print_Msg(currChip);
+    print_Msg(F("/"));
+    println_Msg(totalChips);
 
-    else if (romChips == 1) {
-      println_Msg(F(" 1/2"));
-      myFile.seekCur(0);
-      // Truncate file to size of 1st flash chip
-      if (fileSize > flashSize / 2) {
-        fileSize = flashSize / 2;
-      }
-    }
+    if ((currChip == 1) && (totalChips == 4)) {
+      if (reversed)
+        myFile.seekSet(4194304);
+      fileSize = 2097152;
+    } else if ((currChip == 2) && (totalChips == 4) && (fileSize > 6291456)) {
+      if (reversed)
+        myFile.seekSet(6291456);
+      fileSize = 2097152;
+    } else if ((currChip == 3) && (totalChips == 4)) {
+      if (reversed)
+        myFile.seekSet(0);
+      fileSize = 2097152;
+    } else if ((currChip == 4) && (totalChips == 4)) {
+      if (reversed)
+        myFile.seekSet(2097152);
+      fileSize = 2097152;
+    } else if ((currChip == 1) && (totalChips == 2)) {
+      if (reversed)
+        myFile.seekSet(4194304);
+      fileSize = 4194304;
+    } else if ((currChip == 2) && (totalChips == 2)) {
+      if (reversed)
+        myFile.seekSet(0);
+      fileSize = 4194304;
+    } else if ((currChip == 1) && (totalChips == 1)) {
+      if (reversed)
+        myFile.seekSet(4194304);
+    } else
+      fileSize = 0;  // skip write
 
-    else if (romChips == 2) {
-      println_Msg(F(" 2/2"));
-      if (fileSize > flashSize / 2) {
-        myFile.seekCur(flashSize / 2);
-        fileSize = fileSize - (flashSize / 2);
-      } else {
-        fileSize = 0;
-      }
-    }
     display_Update();
 
     //Initialize progress bar
@@ -2838,6 +2939,15 @@ void writeCFI_Flash(byte romChips) {
     draw_progressbar(0, totalProgressBar);
 
     for (unsigned long currAddr = 0; currAddr < fileSize; currAddr += 512) {
+      if ((reversed) && (currChip == 1) && (totalChips == 1) && (fileSize == 8388608) && (currAddr == 4194304)) {
+        myFile.seekSet(0);
+      }
+      if ((reversed) && (currChip == 1) && (totalChips == 1) && (fileSize == 6291456) && (currAddr == 2097152)) {
+        myFile.seekSet(0);
+        currAddr = 4194304;
+        fileSize = 8388608;
+      }
+
       myFile.read(sdBuffer, 512);
 
       // Blink led
diff --git a/Cart_Reader/SNES.ino b/Cart_Reader/SNES.ino
index 1d5428c..802805e 100644
--- a/Cart_Reader/SNES.ino
+++ b/Cart_Reader/SNES.ino
@@ -66,7 +66,15 @@ static const char* const menuOptionsRepro[] PROGMEM = { reproMenuItem1, reproMen
 static const char reproCFIItem1[] PROGMEM = "1x 2MB";
 static const char reproCFIItem2[] PROGMEM = "2x 2MB";
 static const char reproCFIItem3[] PROGMEM = "1x 4MB";
-static const char* const menuOptionsReproCFI[] PROGMEM = { reproCFIItem1, reproCFIItem2, reproCFIItem3, FSTRING_RESET };
+static const char reproCFIItem4[] PROGMEM = "2x 4MB";
+static const char reproCFIItem5[] PROGMEM = "4x 2MB";
+static const char reproCFIItem6[] PROGMEM = "1x 8MB";
+static const char* const menuOptionsReproCFI[] PROGMEM = { reproCFIItem1, reproCFIItem2, reproCFIItem3, reproCFIItem4, reproCFIItem5, reproCFIItem6, FSTRING_RESET };
+
+// EX ROM config
+static const char reproEXItem1[] PROGMEM = "standard (ABCD)";
+static const char reproEXItem2[] PROGMEM = "reversed (CDAB)";
+static const char* const menuOptionsReproEX[] PROGMEM = { reproEXItem1, reproEXItem2, FSTRING_RESET };
 
 void setupCFI() {
 #ifdef ENABLE_FLASH
@@ -83,13 +91,39 @@ void setupCFI() {
 #endif
 }
 
+boolean reproEXMenu() {
+  boolean fileOrder = 0;
+#ifdef ENABLE_FLASH
+  // create menu with title and 3 options to choose from
+  unsigned char snsReproEX;
+  // Copy menuOptions out of progmem
+  convertPgm(menuOptionsReproEX, 3);
+  snsReproEX = question_box(F("ExROM file order"), menuOptions, 3, 0);
+
+  // wait for user choice to come back from the question box menu
+  switch (snsReproEX) {
+    case 0:
+      fileOrder = 0;
+      break;
+    case 1:
+      fileOrder = 1;
+      break;
+    case 2:
+      resetArduino();
+      break;
+  }
+#endif
+  return fileOrder;
+}
+
 // Setup number of flashroms
 void reproCFIMenu() {
-  // create menu with title and 4 options to choose from
+  boolean reversed = 0;
+  // create menu with title and 7 options to choose from
   unsigned char snsReproCFI;
   // Copy menuOptions out of progmem
-  convertPgm(menuOptionsReproCFI, 4);
-  snsReproCFI = question_box(F("Select Flash Config"), menuOptions, 4, 0);
+  convertPgm(menuOptionsReproCFI, 7);
+  snsReproCFI = question_box(F("Select Flash Config"), menuOptions, 7, 0);
 
   // wait for user choice to come back from the question box menu
   switch (snsReproCFI) {
@@ -97,41 +131,121 @@ void reproCFIMenu() {
     case 0:
       setupCFI();
       flashSize = 2097152;
-      writeCFI_Flash(0);
-      verifyFlash();
+      writeCFI_Flash(1, 1, 0);
+      verifyFlash(1, 1, 0);
       break;
 
     case 1:
       setupCFI();
       flashSize = 4194304;
       // Write first rom chip
-      writeCFI_Flash(1);
-      verifyFlash(1);
+      writeCFI_Flash(1, 2, 0);
+      verifyFlash(1, 2, 0);
       delay(300);
 
       // Switch to second ROM chip, see flash.ino low level functions line 811
       // LoROM
       if (mapping == 1)
-        mapping = 11;
+        mapping = 122;
       // HiROM
       else if (mapping == 2)
-        mapping = 22;
+        mapping = 222;
 
       // Write second rom chip
       display_Clear();
-      writeCFI_Flash(2);
-      verifyFlash(2);
+      writeCFI_Flash(2, 2, 0);
+      verifyFlash(2, 2, 0);
       break;
 
     case 2:
       setupCFI();
       flashSize = 4194304;
-      writeCFI_Flash(0);
-      verifyFlash();
+      writeCFI_Flash(1, 1, 0);
+      verifyFlash(1, 1, 0);
+      break;
+
+    case 3:
+      reversed = reproEXMenu();
+      setupCFI();
+      flashSize = 8388608;
+      // Write first rom chip
+      writeCFI_Flash(1, 2, reversed);
+      verifyFlash(1, 2, reversed);
+      delay(300);
+
+      // Switch to second ROM chip, see flash.ino low level functions line 811
+      // LoROM
+      if (mapping == 1)
+        mapping = 124;
+      // HiROM
+      else if (mapping == 2)
+        mapping = 224;
+
+      // Write second rom chip
+      display_Clear();
+      writeCFI_Flash(2, 2, reversed);
+      verifyFlash(2, 2, reversed);
+      break;
+
+    case 4:
+      reversed = reproEXMenu();
+      setupCFI();
+      flashSize = 8388608;
+      // Write first rom chip
+      writeCFI_Flash(1, 4, reversed);
+      verifyFlash(1, 4, reversed);
+      delay(300);
+
+      // Switch to second ROM chip, see flash.ino low level functions line 811
+      // LoROM
+      if (mapping == 1)
+        mapping = 122;
+      // HiROM
+      else if (mapping == 2)
+        mapping = 222;
+
+      // Write second rom chip
+      display_Clear();
+      writeCFI_Flash(2, 4, reversed);
+      verifyFlash(2, 4, reversed);
+
+      // Switch to third ROM chip
+      // LoROM
+      if (mapping == 122)
+        mapping = 124;
+      // HiROM
+      else if (mapping == 222)
+        mapping = 224;
+
+      // Write second rom chip
+      display_Clear();
+      writeCFI_Flash(3, 4, reversed);
+      verifyFlash(3, 4, reversed);
+
+      // Switch to fourth ROM chip
+      // LoROM
+      if (mapping == 124)
+        mapping = 142;
+      // HiROM
+      else if (mapping == 224)
+        mapping = 242;
+
+      // Write second rom chip
+      display_Clear();
+      writeCFI_Flash(4, 4, reversed);
+      verifyFlash(4, 4, reversed);
+      break;
+
+    case 5:
+      reversed = reproEXMenu();
+      setupCFI();
+      flashSize = 8388608;
+      writeCFI_Flash(1, 1, reversed);
+      verifyFlash(1, 1, reversed);
       break;
 #endif
 
-    case 3:
+    case 6:
       resetArduino();
       break;
   }
@@ -194,7 +308,7 @@ void reproMenu() {
       // ExLoRom
       display_Clear();
       display_Update();
-      mapping = 111;
+      mapping = 124;
       setup_Flash8();
       id_Flash8();
       wait();
@@ -205,7 +319,7 @@ void reproMenu() {
       // ExHiRom
       display_Clear();
       display_Update();
-      mapping = 222;
+      mapping = 224;
       setup_Flash8();
       id_Flash8();
       wait();