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PSP Custom Firmware 6.00-6.61
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Updating The PSP System Software to 6.60 / 6.61 - pspunk
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PSP Custom Firmware 6.00-6.61
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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 Custom Firmware 6.00-6.61
PlayStation Guide
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PSP Firmware Update 6.61 | GBAtemp.net - The Independent Video Game Community
PSP Custom Firmware 6.00-6.61
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How to downgrade your PSP Firmware with Chronoswitch - Darthsternie's Firmware Archive
