Setting Up The GBA ROM Cheating Enviroment
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First, To cheat on a GBA ROM on your PSP, download the gba rom, gPSP 0.8, and Cheat Master. And also DevHook 0.46. Follow the instructions to install. Then go to 1.50F and edit pspbnfc_game and pspbnfc under ms0:/dh/devhook.prx and put ms0:/dh/CheatMaster.prx . Then start up DevHook and put it on 333 MHZ. Then start up FW 1.50F. Then when it loads, it will look like your original 1.50 firmware, but when you go to gPSP, then load up your ROM, and press volume up, and volume down at the same time, this should open up the Cheat Master main menu.
Hope That helps some of you unfamiliar people... :D
Now you're ready for the next tut. Look above :D
Rate if you've tried this or just compliment if you want.