Hi! I have a 6.39 model psp with 6.60 pro cfw and I wan't to uninstall it and install a new cfw maybe even update my system (because it doesn't run any games (it stays on a black screen) and my sd always has a corrupted file in it). I took my memory stick out and restarted my psp. (I tried cold boot) It asked me for date and time. Can't I now just format my memory stick and install new software and cfw. Also should I upgrade my software or stay on my version? Thanks!