Updating Cheats
The latest official GBATemp Cheat Database can be found at codemasters-project.net (requires an account). AKAIO can use the CHEATS.XML, CHEAT.DAT, or USRCHEAT.DAT format. Download the database of your choice and then place the database in the __aio/cheats directory. You can have multiple Cheat Database files in your __aio/cheats directory. Simply re-name each one so that they are not overwritten. (IE: CHEATS-4-10-09.XML, CHEATS-4-30-09.XML).
Rebuild
The Rebuild button will disable all cheats, and then make Cheat Code files per-ROM. Each time you update the Cheats DB you should rebuild the CC file. This will enable the new games to not only use the cheats but build each game a file which allows for faster cheat access