Sony Updates Its PSP Console with Firmware 6.61 – Download Links Available
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Why do so many people prefer 6.60>6.61? : r/PSP
Release: Infinity 2.0 – Enables Permanent 6.6x Custom Firmware for all PSPs! - Wololo.net
PSP Firmware Update 6.61 | GBAtemp.net - The Independent Video Game Community
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PSP 6.61 Infinity Hybrid Firmware by Davee, LME & PRO CFW Patch | PSXHAX - PSXHACKS
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PSP 6.61 Infinity Hybrid Firmware by Davee, LME & PRO CFW Patch | PSXHAX - PSXHACKS
PSP Official Firmware - Hackinformer
PSP Custom Firmware 6.00-6.61
Updating The PSP System Software to 6.60 / 6.61 - pspunk
PSP Alive: Update to OFW 6.60
psp – PlayStation Custom Firmware
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
Complete Guide to PSP Custom Firmware - Revive Today