I've been working on backing up my retail games and their respective .sav files. I have followed all instructions to the letter, yet I have been unable to use the savegame backups of some games. I backup both the game and its save to the sd card, move the rom to the Gateway micro sd card and change its extension to ".3DZ" and change the corresponding game save name to the correct titleid number. one game worked, but others say the save data is corrupt and then proceed to overwrite it with new save data. Any idea what's going on here? I'm at a loss as I have repeated the process with all steps but get the same results. I am on emunand version 9.5.0-22U to play my games, and on sysnand version 9.2.0-20U. not currently downgraded at all. 3DS XL U.S. region.