How to Install Temporary Custom Firmware (CFW) on your PSP - 16 Bit Guide - YouTube
How to Install Custom Firmware (CFW) on PSP 1000 and PSP 2000
HOW TO INSTALL CFW PRO IN PSP TO PLAY ISO GAMES (version 6.20, 6.35, 6.39, 6.60, 6.61) - YouTube
I tried installing 6.61 PRO C2 and infinity v2.0.3 on my psp 3001 (following the instructions on the CFW guide of this subreddit) but it just shows corrupted data when I disconnect,