Why would you ever do that? Sony's 3.80 is worse than M33 3.80. Its galaxy.prx causes a lot of problems on a lot of Memory Sticks. DAX fixed that in M33-4i mean the other way around
CFW to original
i have an aus launch day psp if that means anythingIIRC, you can't go straight, as CFWs fail to run official firmware updates (they fail with the error "DADADADA"
Also, you need a complete factory set of IDStorage keys, which you may not have if your PSP is TA-082 or higher