GodMode9 is a full access file browser for the Nintendo 3DS console, giving you access to your SD card, to the FAT partitions inside your SysNAND and EmuNAND and to basically anything else. Among other functionality, you can copy, delete, rename files and create folders.
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Note that, on some versions of Luma3DS, the Luma3DS chainloader menu is only displayed if there is more than one payload detected. If there is only one payload detected, holding (Start) on boot will directly launch GodMode9.
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This is powerful stuff, it provides you with the means to do basically any thinkable modification to any system data available on the 3DS console. However, precautions are taken so you don't accidentally damage the data of your console.
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The write permissions system protects you by providing warnings and forces you to enter an unlock sequence for enabling write permissions. It is not possible to overwrite or modify any important stuff without such unlock sequences and it is not possible to accidentally unlock something. As always, be smart, keep backups, just to be safe.
1. Boot your device while holding (Start) to launch the Luma3DS chainloader menu
1. Launch GodMode9 by pressing (A)
1. Press (Home) to bring up the action menu
1. Select "More..."
1. Select "Backup NAND"
1. Press (A) to continue
1. Hold (R) and press (B) at the same time to eject your SD card
1. Insert your SD card into your computer
1. Copy `nand.bin` from the `/gm9out/` folder on your SD card to a safe location on your computer
+ If you previously used SafeCTRTransfer and have a NAND backup named `<serialnumber>_nand.bin`, replace it with this one (rename `nand.bin` to match `<serialnumber>_nand.bin`)
+ Make backups in multiple locations (such as online file storage)
+ This backup will save you from a brick if anything goes wrong in the future
1. Delete `nand.bin` from the `/gm9out/` folder on your SD card after copying it
1. Reinsert your SD card into your device
## <a name="nand_restore" /> Restoring a NAND Backup
#### Instructions
1. Boot your device while holding (Start) to launch the Luma3DS chainloader menu
1. Launch GodMode9 by pressing (A)
1. Navigate to `[0:] SDCARD`
1. Press (A) on your NAND `.bin` to select it, then select "NAND image options...", then select "Restore SysNAND (safe)"
1. Press (A) to unlock SysNAND overwriting, then input the key combo given
+ This will not overwrite your boot9strap installation
1. Input the key combo given to unlock SysNAND (lvl1) writing
+ This process will take some time
1. Once it has completed, press (A) to continue
## <a name="injectHS" /> Injecting any .CIA app into Health & Safety
#### Prep Work
+ For organizational purposes, copy the `.cia` file you wish to inject to the `/cias/` folder on your SD card
+ Note that it is not possible to inject files into Health & Safety that are larger than it (including games and other large applications)