PSP 6.60 PRO - B9, B10 CFW installation [Very Easy] (PSP 3000, 2000, 1000 and PSPGo) - YouTube
STUCK IN SETTING MENU PSX .. CFW 6.60 PRO C | Page 2 | GBAtemp.net - The Independent Video Game Community
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
Updating The PSP System Software to 6.60 / 6.61 - pspunk
VERY EASY) Install Custom Firmware 6.60 PRO B10 PSP 1000, 2000, 3000 + DL - YouTube
PlayStation Guide
How to Downgrade PSP Firmware - Nerd Bacon Reviews