3DS:Ntrboot/usage

ntrboot allows  payloads to run entirely independent from the console's firmware, so it can be used to fix all software issues short of a locked NAND. However, it can also cause the same issues if used incorrectly - be careful to get things right the first time, as the instructions may be harder to follow after a failed attempt.

Reinstalling the bootloader
If you have installed a bootloader that cannot boot the system normally with CFW otherwise working, you can run GodMode9, SafeB9SInstaller, or OpenFirmInstaller via ntrboot to install a valid bootloader in its place. The following instructions will have you run SafeB9SInstaller through GodMode9 to avoid an issue with the  step of SafeB9SInstaller.

What you need

 * The latest release of [SafeB9SInstaller] (the  file that isn't the source code)
 * The latest release of [GodMode9] (the  file that isn't the source code)
 * The latest release of [boot9strap] (the  file - not ntr-devkit, ntr, or devkit)

Section I - Prep Work

 * 1) Insert the flashcart's SD card into your computer
 * 2) Copy   from the SafeB9SInstaller   to the root of your SD card
 * 3) Copy   from the GodMode9   to the root of your SD card and rename it to
 * 4) Reinsert the flashcart's SD card into your flashcart
 * 5) Insert the console's SD card into your computer
 * 6) Create a folder named   on the root of your SD card
 * 7) Copy   and   from the boot9strap   to the   folder on your SD card
 * 8) Reinsert the console's SD card into your console

Section II - ntrboot and installation

 * 1) Use your magnet to find the spot on your device that triggers sleep mode
 * 2) Power off your console and insert the flashcart
 * 3) Set the magnet into place (or on an old 2DS, enable the sleep mode switch), then hold, , and  and press  - continue to hold the other three buttons for around five seconds
 * 4) * This may take a few tries to work since the positioning is awkward - if you boot into anything other than GodMode9, power off and try again
 * 5) Remove the magnet or disable the sleep mode switch - if the exploit was successful, you will have booted into GodMode9
 * 6) If asked, press  to deny setting RTC and/or doing an essential files backup, then navigate to   and press A, choose   and then choose.
 * 7) When prompted, input the key combo given on the top screen to install boot9strap
 * 8) When the install is complete, hold the power button to forcibly power off your console

Recovering from software bricks
If your console has been bricked not due to hardware damage, then you can recover the system with ntrboot by loading GodMode9. From there, you can use needed tools depending on the specific issue - the most common three are listed as follows.

Recovering from an unusable NAND
See how to restore a NAND backup for more specific instructions. If you do not have a NAND backup, you will instead need a CTRTransfer, [a manual CTRTransfer], or |Lazarus3DS donor files potentially alongside a hardmod, depending on how severe your issue is.

Recovering from corrupted FIRM partitions
See, even if you see a BootROM error when powering on your console.

Issues with uninstalling custom firmware
If you have a NAND backup from when you first installed custom firmware, restore it. If you do not, then reinstall custom firmware to make the system usable again.

Installing CFW in edge cases
For cases where your system cannot normally install CFW (such as being unable to use seedminer or having broken parts of the system that make it impossible to follow any of the alternate pathways), ntrboot can still install CFW.