How to Hack Any PSP All Firmwares Supported, All Models Supported - Infinity 2.0 Permanent CFW - YouTube
May's firmware updates made PS3, Vita, and PSP games harder to get (and some inaccessible) : r/Games
PRO Firmware PSP - GameBrew
PlayStation Portable homebrew - Wikipedia
PSP 6.61 Custom Firmware Install on any PSP - PSP, PSP Slim, PSP 3000, PSP Go & E1000 | Digiex
PSP: First hacks for the new Firmware 6.61 - PRO CFW & Downgrader updated! - Wololo.net
Unbrick PSP 2000/3000 Systems - Pandora Battery Style! [Hardware Jig Required] | GBAtemp.net - The Independent Video Game Community
How To Hack your PSP to 4.01 M33-2 | Welcome to the Underground.
Is your PSP hackable? - Wololo.net
Release: Infinity 2.0 – Enables Permanent 6.6x Custom Firmware for all PSPs! - Wololo.net
Mod a PSP | Super Easy | 6.60 PRO-C - YouTube
I created a guide back in January to hack the PSP, because most guides were outdated and did not work. I improved the guide and removed and added some things. Here it