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PSP FAQ - How Do I Update My PSP Firmware?
Access and download games on 6.60 CFW from official PS Store? : r/PSP
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PSP Custom Firmware 6.00-6.61
PSP Custom Firmware 6.00-6.61
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psp – PlayStation Custom Firmware
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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
4 Ways to Upgrade Your PSP Firmware - wikiHow
Release: Infinity 2.0 – Enables Permanent 6.6x Custom Firmware for all PSPs! - Wololo.net