Official Update Propellerhead Reason 3 Rapidshare.com/files 3.0.5 How To Install Custom Firmware On A Psp W/official 3.95 Update??

How to install custom firmware on a psp w/official 3.95 update?? - official update propellerhead reason 3 rapidshare.com/files 3.0.5

I have a PSP (1 fat) w / 3.95 official update ... should I switch? Or should I install the Pandora Battery to ... How else can I do with the update so high?