How to downgrade your PSP Firmware with Chronoswitch - Darthsternie's Firmware Archive
How To Easy Jailbreak Any PSP 6.61 CFW Permanent - Consoleinfo
PSPHACKS 1.03] Downgrading Your Custom Firmware From 6.61 to 6.60 Using Chronoswitch 7.0 - YouTube
how to downgrade psp firmware - chronoswitch - YouTube
Got this baby. System version is 6.39. Never been hacked. What should I do to hack it? 6.60 or 6.61? Confirmation button is O. Can I switch it to X with Infinity