PSPHACKS 1.03] Downgrading Your Custom Firmware From 6.61 to 6.60 Using Chronoswitch 7.0 - YouTube
How to downgrade your PSP Firmware with Chronoswitch - Darthsternie's Firmware Archive
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 DOWNGRADE TO ANY FIRMWARE | PSP | JURAMEEHS - YouTube
How to: PSP® CFW and OFW Downgrading - wololo.net/talk
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How to downgrade your PSP Firmware with Chronoswitch - Darthsternie's Firmware Archive
Have firmware, will downgrade: PSP v3.03 downgrader released | Ars Technica