i have a ta-82 mobo, but every psp that i have tried to modify with a ta-81 or anyhting like that have some sort of problems, never had any problem with the others, is it posable that the 81s, are just buggy and not ment to be this high of a firmware? they where the first brand of psp i belive... try and get yourself a 82 mobo, also if this is wrong don't blame me... i sure as hell am not an expert.