How To Update Any PSP To Official 6.61 In 2018! - YouTube
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Infinity 2.0 released for the PSP, allows for persistent CFW on all models of PSPs on 6.60 and 6.61 | GBAtemp.net - The Independent Video Game Community
PSP Firmware Update 6.61 | GBAtemp.net - The Independent Video Game Community
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Risen from the dead: PSP Firmware 6.61 is now available! - Wololo.net