I have a PHAT-1001, and initially it was in 3.90 m33-3 CFW.
But since I upgraded it to 6.60 OFW, it works fine in OFW mode.
But the PSP completely FREEZES whenever the device reboots for the first time in CFW mode (even before installing the CIPL Flasher).
When freezes, only the select button works at XMB, even when the VHS menu appears, its forcibly highlighted at the exit command. Also then when I manually reboot, it starts with the OFW again and keeps working fine like before.
NOTE - I have tried several OFWs and CFWs for them. No matter what firmware, it FREEZES!
Thank a ton in advance!