Tested on PSP-2000 (Slim), Memory Stick Pro Duo 8GB (Sony).
A functioning Memory Stick Pro Duo (usually 1GB or larger). psp 352 m33 upgrade to 660
Ensure you know if you have a PSP-1000, 2000, 3000, or Go. Tested on PSP-2000 (Slim), Memory Stick Pro Duo 8GB (Sony)