Hardmod Downgrade - lourinaldi/Guide GitHub Wiki

The version of autofirm used in this guide was modified from Reboot.ms's autofirm which was modified from 'Raugo's original autofirm, it is being rehosted with permission.

If you are on 11.0.0 or 11.1.0, you must follow this guide to downgrade your NATIVE_FIRM using a hardmod in order to directly dump and restore your NAND.

An excellent guide to getting a hardmod can be found here.

This is a currently working implementation of the "FIRM partitions known-plaintext" exploit detailed here.

This will work on both a New and Old 3DS.

What you need

• Your NAND image extracted using your hardmod
• The latest version of autofirm
• The latest release of 3DSident
• The firmware zip corresponding to your device and version:
  • New 3DS 11.0.0 to 10.4.0 (mirror) (mirror)
  • Old 3DS 11.0.0 to 10.4.0 (mirror) (mirror)
    ~
  • New 3DS 11.1.0 to 10.4.0 (mirror) (mirror)
  • Old 3DS 11.1.0 to 10.4.0 (mirror) (mirror)

Instructions

Section I - NAND modification

1. Extract the autofirm zip to a folder
2. Place a copy of your NAND backup (named nand.bin) in the autofirm folder
3. Copy the contents of the firmware zip to the autofirm folder
4. Run "autofirm.bat" and select which device and version the NAND backup is for
5. Wait while the script runs
6. If everything worked, then your original NAND will have been renamed to backup_nand.bin and you will have a modified nand.bin containing the 10.4.0 NATIVE_FIRM
7. Flash this nand.bin to your device with your hardmod

Section II - Exploit verification

1. Copy and merge the 3ds folder from the 3DSident zip to your device's SD card
2. Reinsert your SD card into your 3DS
3. Launch the homebrew launcher on the device

• If the device is under 11.1.0 with browser, you should use browserhax
• If the device is under 11.1.0 without browser, you should use Homebrew Launcher (No Browser)
• If the device is on 11.1.0 with or without browser, you should use Homebrew Launcher (No Browser)

4. Launch 3DSident
5. Verify that the following:

• Kernel version: 2.50-11
• FIRM version: 2.50-11
• If either of these do not display the versions above, something has gone wrong and you should try again from the beginning

Your version number will not have changed in the settings.

You can now continue from either Homebrew Launcher (No Browser) or Homebrew Launcher (Browser), depending on what the Part 1 - Decrypt9 chart specified for your version.