I'm using the script from this thread
gbatemp.net/threads/eversd-rom-artwork-scripts-for-fw-2-x-stock-ui.605202/
With the stock emulators because that one seems to work on the VS. as well, I was able to play DKC2 all night until now on the VS. (for the record, I use a 128GB micro sd card. I could play all roms except RetroArch on the VS.
FW 2.1
I tried GBC but the SNES games have the same problem, nothing is being saved with every ROM that i tried.
Hope you've got enough info.