How to Downgrade PSP Firmware - Nerd Bacon Reviews
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System Update
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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
Playstation Portable (PSP) softmod - Dreamcast.nu
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Updating The PSP System Software to 6.60 / 6.61 - pspunk
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Sony Updates Its PSP Console with Firmware 6.61 – Download Links Available
PSP 6.61 Custom Firmware Install on any PSP - PSP, PSP Slim, PSP 3000, PSP Go & E1000 | Digiex
PSP Official Firmware - Hackinformer
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