Hi! First of all, thank you for this amazing piece of software. It has all the features I've waited and dreamed for years in nanoloop. And more!
Anyone here has tried to run it on those SuperChris Prime flashcarts from aliexpress? I know they're cheap and everything, but people that reviewed it for games say it runs flawlessly. However, I just can't save any slots in any banks, it gives me a "full bank" message. The fms-sram.gba runs fine, which shows that the problem is in the cart's 1mb sram (or lack of). What bugs me is that the cart's firmware (SuperFW 0.20) runs a test for sram and says it's working fine. It saves the .sav file right when you load the rom. It just won't let FMS save any bank. :(
EDIT: I don't know if this helps, but I tested a game rom that uses 128 KB save file, and it saved and loaded without any issues.
SuperChis seems to be problematic with FMS, those carts (and the firmware) are primarily made for commercial games that used the official SDK, which FMS does not use.
But you're saying that the SRAM version runs fine, as in saving? The "full" flash-saving version will definitely not work on any supercard-based cart.