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
PSP Custom Firmware 6.00-6.61
Music tracks, songs, playlists tagged 6.60 on SoundCloud
PSP Official Firmware - Hackinformer
Release: Infinity 2.0 – Enables Permanent 6.6x Custom Firmware for all PSPs! - Wololo.net
4 Ways to Upgrade Your PSP Firmware - wikiHow
PSPHACKS 1.03] Downgrading Your Custom Firmware From 6.61 to 6.60 Using Chronoswitch 7.0 - YouTube
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
PSP Custom Firmware 6.00-6.61
4 Ways to Upgrade Your PSP Firmware - wikiHow
PSP 6.60 PRO - B9, B10 CFW installation [Very Easy] (PSP 3000, 2000, 1000 and PSPGo) - YouTube
How to Mod a PSP to Custom Firmware | Super Easy | 6.60 PRO-C | Tutorial... : r/psphacks
Complete Guide to PSP Custom Firmware | ReviveToday
PS3 System Update 3.70 and PSP System Update 6.60 Incoming
PSP - POPSloader 6.60 PRO (PS1 on PSP) | PSX-Place