I bought this PSP 2004 for 25€ in 2015. I've since reshelled it 3 times and installed a 3000 mAh bat. I really love this new blue translucent color! : r/PSP
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
Hack, Install Custom Firmware on Sony PSP-E1004 Street