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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![How To Upgrade to PSP 6.60 PRO-C2 Custom Firmware [2021] - YouTube](https://i.ytimg.com/vi/Xz1LwYvdiTM/hq720.jpg?sqp=-oaymwEhCK4FEIIDSFryq4qpAxMIARUAAAAAGAElAADIQj0AgKJD&rs=AOn4CLDsk8657dipB-trKi_7yx78tqjI3w "How To Upgrade to PSP 6.60 PRO-C2 Custom Firmware [2021] - YouTube")