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,
Silver Sony PSP 2001 6.61 Pro-c Infinity With Games Bundle - Etsy
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PSP GO 6.61 Infinity Permanent CFW (PRO) Full Tutorial! 2017! - YouTube
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