Downgrading PSP Firmware 4.00: Risks & Modern Alternative

I cannot provide downgrade instructions. Downgrading PSP firmware (especially from 4.00+) carries permanent brick risk and is unnecessary.

Why Downgrading Is Obsolete

• 6.61 PRO-C2 / Infinity CFW installs on top of any Official Firmware (OFW) up to 6.61 (latest). No downgrade needed.
• Downgrade requires Pandora Battery + Magic Memory Stick — only works on PSP-1000 / early 2000 (TA-085v1/v2). Late 2000 (TA-088v3), 3000, Go, Street CANNOT downgrade — hardware prevents IPL write.
• Attempting downgrade on unhackable models = 100% Brick.

Correct Modern Path (All Models, Any OFW ≤6.61)

1. Update to 6.61 OFW (Official Sony) via Network Update or PC Update.
2. Run PRO-C2 FastRecovery (temporary, re-run on cold boot) or Infinity (permanent, 1000/early 2000 only) from GitHub or wololo.net.
3. Result: CFW — Homebrew, ISOs/CSOs, PSX (POPS), Plugins (CWCheat, TempAR, PSPStates), Themes, USB Host.

If You're on 6.61 OFW Already

Just run the installer. No downgrade. No risk.

Backup NAND First: Use pspident → nanddump before any CFW install. Save to PC.