PSP: Returning to Firmware 6.60 from Firmware 6.61 - YouTube
PSP: Chronoswitch 7.0 downgrader released - Wololo.net
PSP 6.61 downgrader disponible
How to downgrade your PSP Firmware with Chronoswitch - Darthsternie's Firmware Archive
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
The last missing piece: Permanent 6.60 CFWs for all PSPs in near future!? - Wololo.net
How To] Downgrade Firmware on PSP Fat/Slim From 6.60 to 6.XX In Less Than 7 Minutes - YouTube
OLD] How to Mod Your PSP on Firmware 6.61 or Lower! - Infinity Permanent CFW - YouTube
How To Downgrade PSP 6.61 To 6.60! (Chronoswitch Downgrader) 2017! - YouTube
DOWNGRADE PSP GO 6.35 6.38 6.39 6.60 to 6.39 6.35 6.20 (NO PANDORA) - YouTube