I can not understand why some work and some don't! PRO supports the latest firmware (version 661) released by Sony, and it is recommended that you upgrade to receive the latest fixes and improvements before proceeding However, if you do wish to remain with an older firmware, the latest custom firmware version supports back to 6 PSP 661 Custom Firmware Install on any PSP PSP, PSP Slim, PSP 3000, PSP Go & E1000 This guide recommends 401 M332 for the firmware, so I've wondering if 660 PROC2 has a different method of enabling recovery mode?
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