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,
Sony PlayStation Portable Slim 32Gb CFW 6.61 PRO-C Infinity Full of Games Bundle [PSP], Video Gaming, Video Game Consoles, PlayStation on Carousell
PSP GO 6.61 Infinity Permanent CFW (PRO) Full Tutorial! 2017! - YouTube
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PlayStation Guide
PSP Infinity 2.0 Install Guide! (6.61 - 6.60) (WORKING ON EVERY PSP) - YouTube
Infinity 2.0 released for the PSP, allows for persistent CFW on all models of PSPs on 6.60 and 6.61 | GBAtemp.net - The Independent Video Game Community
How To Fix Corrupted PSP 6.61 Infinity Firmware! - YouTube
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Tutorial] Install PSP 6.61 Pro-C Infinity Custom Firmware | GBAtemp.net - The Independent Video Game Community
PSP: Davee's Infinity permanent CFW for PSP 6.61 "pretty much done" (Video) - Wololo.net
Sony PlayStation Portable Brite 32Gb CFW 6.61 PRO-C Infinity Full of Games Bundle [PSP], Video Gaming, Video Game Consoles, PlayStation on Carousell
PSP: 6.61 Infinity - Davee's 'Permanent Patch' for System Software 6.61 - Wololo.net