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,
Custom Firmware PRO | PSP.SceneBeta.com
Install PRO-C2 Custom Firmware! *6.61 - Fast Recovery* (Mod The PSP) - YouTube
PRO-C2 infinity UMD ISO mode blank. Help? : r/PSP
PSP CFW6.61 PRO-C2リリース [導入方法] | Kotyan Life
Mod your PSP!! 6.61 Pro C2 CFW All Models - YouTube