Psp 352 M33: Upgrade To 660 Portable

The safest path is to return to an official Sony firmware (OFW) first, then bridge to 6.60. Phase 1: Preparing for the Jump Charge Your Battery : Ensure it is at

Because 3.52 M33 is a very old "Open Edition" style firmware, you may encounter specific hurdles during the upgrade: PSP: Updating from the 3.xx OE CFWs to the 6.60 ME CFW psp 352 m33 upgrade to 660 portable