Anyone have a guide? My PSP is a 2003 Slim on 6.60 Pro B10. I tried to just run the official 6.60 update over my custom firmware but it didn't run. I also remember editing a certain .ini to fool updates into thinking I was already on latest firmware so I couldn't accidently undo the hack with an overwrite. Any help much appreciated, I have a pandora battery if one is needed to do this. I am trading it against my Vita next week for £50 so need it reset as sometimes the staff check the system information and it clearly says Pro B on it.