3DS:Error screens/Luma3DS exception screen

This page lists possible causes and fixes of Luma3DS exception screens. They are not applicable to every situation, but cover most common known issues. Note that the prefixes on file paths refer to the starting location. sdmc:/ refers to the SD card, and numbers in the format of [X:] refer to GodMode9's drive numbers.

If the below fixes do not solve your issue or you are unsure of what to do, join the [Nintendo Homebrew Discord] for further assistance.

Arm9

On boot

Files on the SD are corrupted.
- To fix, verify that your card is not faulty. If it is verified working, make a backup of all intact files, format the SD card, and try booting again.
A system save located on the NAND in [1:]/data has a problem.
System-unique files are missing from the NAND in [1:]/rw/sys.

Prefetch abort (svcBreak)

The system's movable, [1:]/private/movable.sed, is 288 bytes but its flag indicates otherwise.
SYSNAND CTRNAND has bad CMACs.
- To fix, press R+A on the SYSNAND CTRNAND drive and Fix CMACs for drive. Your system will act like it has been formatted after this, and this is intended.

Data abort

SYSNAND TWLN's [2:]/shared2 folder is missing.
- To fix, create this folder.
System titles have been deleted.
- To fix, perform a Safe Mode update.

During use

Files on the SD are corrupted.
- To fix, verify that your card is not faulty. If it is verified working, make a backup of all intact files, format the SD card, and try again.

Arm11

On boot

boss (0004013000003402), data abort

The current firmware version is too old for SpotPass to work.
- To fix, perform a Safe Mode update. If this does not work, you may require a CTRTransfer.

fs (0000000000000000)

Can be anything from SD card problems to hardware issues.

hid (0004013000001D02)

Potential hardware problems.

menu (000400300000__02), data abort

Broken HOME Menu theme.
- To fix, go into the folder sdmc:/Nintendo 3DS/<ID0>/<ID1>/extdata/00000000/ and delete the folder matching your region, one of the following:
  - USA: 000002cd
  - EUR: 000002ce
  - JPN: 000002cc
Broken HOME Menu extra data.
- To fix, go into the folder sdmc:/Nintendo 3DS/<ID0>/<ID1>/extdata/00000000/ and delete the folder matching your region, one of the following:
  - USA: 0000008f
  - EUR: 00000098
  - JPN: 00000082
  - KOR: 000000A9
Broken HOME Menu application.
- To fix, perform a Safe Mode update.
- If this does not fix it, attempt to enter System Settings before the crash occurs and find the broken application in Data Management, if possible.
- If this does not fix it, you may try to enter GodMode9 and use its title list to find the broken application - this is risky, however, and should not be attempted without guidance unless you know exactly what you are doing. For guidance, join the [Nintendo Homebrew Discord].

menu (000400300000__02), prefetch abort

An installation of menuhax is conflicting with your custom firmware.
- To fix, place the menuhax67_installer.3dsx file from [this download] into sdmc:/3ds, run it through Homebrew Launcher, and choose REMOVE.

menu (000400300000__02), prefetch abort (svcBreak)

The f000000b folder in SYSNAND CTRNAND is broken, its exact location being at [1:]/data/<ID0>/extdata/00048000/f000000b.
- To fix, backup that folder by pressing R+A while highlighting it, then select Copy to 0:/gm9/out. Once backed up, delete the folder. If this does not fix the issue, copy the folder back where it was.

pm (0000000000000000), undefined instruction

The installed version of Luma3DS does not support the current firmware version.
- To fix, update CFW.

During use

loader (0000000000000000)

If the hexadecimal number next to R0 starts with 'C' or 'D', search for it as an error code or in 3DS:Error_screens/Luma3DS_ErrDisp.
These errors are usually due to corruption, such as a faulty SD card, dying game cartridge, or dirty cartridge reader.