I edited and added more info to my post #4
***
After you've verified the
empty SD card is good hardware-wise with H2testw,
- Hold (SELECT) button while turning on the 3DS → Luma3DS v#.# configuration
- (x) Enable game patching
- (x) Show NAND or user string in System Settings
- For whichever game that requires Luma Locale Emulation, use the homebrew app LumaLocaleSwitcher.
- Note: Some region-free games may require locale emulation.
- Note: Not all out-of-region games require locale emulation.
- sdmc:/luma/titles/000400000XXXXX00/locale.txt
-
- 000400000XXXXX00 = title id
- RRR = region ( JPN, USA, EUR, AUS, CHN, KOR, TWN )
- LL = language ( JP, EN, FR, DE, IT, ES, ZH, KO, NL, PT, RU, TW )
***
If Luma Locale Emulation also doesn't work, the most likely explanation is that the standard
CTRTransfer /
region changing going from JPN → USA did not go as planned.
Try repairing the 3DS firmware + custom firmware with
CTRTransfer (Type D9) - CTRTransfer.
- You can keep the region changed USA firmware if you wish.