Acekard 2i Help

Ok so on some games when I click cheats, it says Rebuilding Cheat Database. Then it goes about a little less than half way and stops. I have left it like that for almost 30 minutes and it stays in that same spot. I know it didn't freeze because the time on the top screen keeps going. I have tried turning it on and doing it again, it always does the same thing. Help? Thanks in advance

Try backing up all your files and reformat your MicroSD. Reinstall your cheat database as well, and remove some unused game entries from it.

Which cheat database should I use since theres a couple that I can use

CHEAT.DAT or CHEATS.XML from http://cheats.gbatemp.net/.