Before installing modern CFW, you must move from your current legacy CFW back to the official 6.60 base.
To upgrade your PlayStation Portable (PSP) from the legacy custom firmware to the modern psp 352 m33 upgrade to 660
: A mini-USB cable to transfer files from your PC. Before installing modern CFW, you must move from
: Find a reputable source for 6.60 CFW for your PSP. Popular sites include the official forums of PSP communities or known homebrew sites. Before installing modern CFW
: Before you start, make sure to backup your PSP data. Use a Memory Stick Duo to save your game saves, pictures, music, and any other important files.