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,
PSP Custom Firmware Guide For All Models 2022 - pspunk
4 formas de actualizar el PSP - wikiHow
Actualizar y crackear PSP a la version 6.61 - YouTube
Custom Firmware 6.61 PRO C2: Descargar e Instalar 【2022】
Custom Firmware PRO | PSP.SceneBeta.com
PSP 6.61 Infinity Hybrid Firmware by Davee, LME & PRO CFW Patch | PSXHAX - PSXHACKS