a tool called Chronoswitch Downgrader (Version 7.0 or newer), which ignores the M33 software blocks. Connect your PSP to a computer via USB.
| Item | Specification | |------|----------------| | PSP Model | 1000, 2000 (non-TA-088v3), 3000, Go, E1000 (Street) | | Battery | ≥75% charge | | Memory Stick | ≥256 MB (512 MB+ recommended) | | USB Cable | Mini-USB (for PC transfer) | psp 352 m33 upgrade to 660