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,
Release: Despertar del Cementerio 9.01 for PSP - Hackinformer
How to Unbrick a PSP 3000 (Video Guide by Khubik) - Wololo.net
How to Run Downloaded Games on a PSP (with Pictures) - wikiHow
How to Mod Any PSP on Firmware 6.61 or Lower! - Infinity 2.0 Permanent CFW - YouTube