a tool called Chronoswitch Downgrader (Version 7.0 or newer), which ignores the M33 software blocks. Connect your PSP to a computer via USB.
Rationale: 5.00 M33-6 is the oldest CFW that understands the 6.xx NAND structures and has a functional "Network Update" spoof. psp 352 m33 upgrade to 660
Note: Your PSP is now on official firmware and cannot run homebrew or ISOs yet. a tool called Chronoswitch Downgrader (Version 7
| Error / Symptom | Solution | |----------------|----------| | “The game could not be started (80020148)” | Install NoDRM Engine or use npdrm_free plugin. | | Permanent patch fails (PSP-3000) | Reinstall OFW 6.60 → Use PRO + FastRecovery only. | | NAND corruption after upgrade | Restore NAND via Hellcat’s (requires Pandora battery on PSP-1000). | | Wi-Fi not connecting | Reset settings → Use WPA1/TKIP (WPA2 sometimes fails). | | “IDStorage mismatch” during downgrade | Use KeyCleaner to regenerate keys (advanced). | Note: Your PSP is now on official firmware