HOW TO INSTALL CFW PRO IN PSP TO PLAY ISO GAMES (version 6.20, 6.35, 6.39, 6.60, 6.61) - YouTube
Sony PSP CFW 6.61 on PSP-1000 and PSP-3000 – McRetro.net
The 6.xx ME & LME Custom Firmwares for the PSP will receive yet another update in near future! - Wololo.net
Console info - How To Easy Jailbreak Any PSP 6.61 CFW Permanent. Tools : - 6.61 PRO C2 - infinity-2.0.3 Video Tutorial : https://youtu.be/l7-lmtrVbJo | Facebook
CFW Pro Archives - Wololo.net
How To Mod Your PSP - CFW 6.61 PRO Infinity - YouTube
PSP: First hacks for the new Firmware 6.61 - PRO CFW & Downgrader updated! - Wololo.net
PSP 6.61 Custom Firmware Install on any PSP - PSP, PSP Slim, PSP 3000, PSP Go & E1000 | Page 19 | Digiex
PSP Custom Firmware 6.00-6.61
tutorial] Software modding your PSP 1000-3000 to play/find Emulated rom's and PSP ISO's : r/PSP