Updating PSP from 3.10 to 3.90: Don't—6.61 CFW Is the Modern Path

Do not attempt to update directly from 3.10 to 3.90. Firmware 3.90 does not exist for retail PSP. The final official firmware is 6.61 (released 2015). Version numbers like 3.90 refer to custom firmware (CFW) versions (e.g., 3.90 M33, 3.90 GEN) from 2008–2009.

Dangers of Flashing Old CFW

• Brick Risk: Flashing 2008 CFW on 2005 firmware (3.10) without proper steps (Pandora Battery + Magic Memory Stick) causes full brick (unrecoverable without hardware flasher).
• Incompatibility: Old CFWs lack drivers for later hardware (PSP-3000, Go, Street) and break PSN/SSL (no modern TLS).
• No Benefit: 3.90 M33 cannot run ISOs/CSOs formatted for 6.xx kernels, lacks PSN spoofing, and has no plugin support for modern homebrew.

Correct Modern Path (2024)

1. Update to 6.61 Official (OFW): Settings → System Update → Update via Internet (or download EBOOT.PBP for 6.61 → place in PSP/GAME/UPDATE/ → run from Game menu).
2. Install CFW (LME / PRO / Infinity):
   • PSP-1000 / 2000 (non-TA-088v3): Install 6.61 PRO-C2 / Infinity 2.3 → Permanent patch (survives reboot).
   • PSP-2000 (TA-088v3) / 3000 / Go / Street: Install 6.61 LME-2.3 / Infinity 2.3 → FastRecovery required after every cold boot (hold R trigger).
3. Result: 6.61 kernel, PSN access (via spoof/plugins), full ISO/CSO/PBP/PS1/homebrew support, modern TLS for browser/GitHub updaters.

Resources

• Guide: hacks.guide/psp (updated, step-by-step).
• Files: Internet Archive PSP CFW Pack (OFW 6.61, PRO, LME, Infinity, FastRecovery).

Never use Pandora/Magic Memory Stick methods unless you have a pre-2008 brick to recover.