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[PSPHACKS 1.01] How To Install 6.60 PRO-C Fix 3 using Infinity 2.0.3 Permanent Custom Firmware - YouTube
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Downgrading 3004 from 6.61 PRO-C2∞ to 6.60, error LPTFFFFFFFE, still boots into 6.60, UMD not working · Issue #2 · DaveeFTW/Chronoswitch · GitHub
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