Download the 6.60 Official firmware update from the official Sony website.
The upgrade path is stable. I have never bricked a PSP going from M33 to PRO. As long as you follow the steps (Update to Official 6.60 first ), you are safe. psp 352 m33 upgrade to 660 portable
If you are looking for the latest software to transfer games, check the official Sony PSP support pages for any available software utilities. Download the 6
What is the exact inside your battery well (e.g., PSP-3001, PSP-3004) to confirm compatibility? Share public link psp 352 m33 upgrade to 660 portable
This is critical. The method to upgrade differs slightly depending on your motherboard. 3.52 M33 was popular on and early PSP-2000 (Slim) models.