Hi, I recently got a 3DS LL in Japanese because they are less expensive than the US versions right now, and installed homebrew, cfw, and everything so I could play U.S. region games and do other things. I didn’t region unlock it because it doesn’t bother me enough to put in the effort to change it.
However, I decided to start up my old copy of New Leaf on a cartridge and I was instantly prompted to update it. I thought it was kinda weird because I’m pretty sure my cartridge is the welcome amiibo version so it already has the update? But I let it update. Then when the home screen popped up it was obviously not my town and when I tried to start the game it said the save data was corrupted and would be deleted. I have a 2ds XL in english so I put the exact same cartridge in that console to see if the save data was actually corrupted, and it was not. The game loaded in normally with my town intact. Then back on my Japanese 3DS, I installed the U.S. New Leaf welcome amiibo cia to see if I could transfer my save that way, and again was prompted that my save data was corrupted. So it seems to be something specific on my JPN console that I am missing, not my cartridge or save itself. Is it something to do with my sysNAND? Is it because I never region swapped my console, the “update” is for the Japanese version and so the only way to fix it would be to set my 3ds to US/English and update it that way. Otherwise I totally have no idea what I am doing wrong or how to fix it.
Any suggestions or solutions would be greatly appreciated, thank you in advance.