How to downgrade your PSP Firmware with Chronoswitch - Darthsternie's Firmware Archive
PSP: Chronoswitch 7.0 downgrader released - Wololo.net
I was trying to downgrade my PSP go to 6.20, but it warned me that the [Resume game] feature would be deleted. Does that mean I won't be able to use the
PSP: First hacks for the new Firmware 6.61 - PRO CFW & Downgrader updated! - Wololo.net