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How To Update Your PSP TO 6.61 Official Firmware in 2021 - YouTube
Why do so many people prefer 6.60>6.61? : r/PSP
PlayStation Guide
Install PSP 6.61 Pro-C Infinity Custom Firmware | GBAtemp.net - The Independent Video Game Community
Complete Guide to PSP Custom Firmware | ReviveToday
Infinity 2.0 released for the PSP, allows for persistent CFW on all models of PSPs on 6.60 and 6.61 | Page 2 | GBAtemp.net - The Independent Video Game Community
CFW Pro B9 is out, adds 6.60 compatibility - Wololo.net
PSP: Updating from the 3.xx OE CFWs to the 6.60 ME CFW - YouTube