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PSP Firmware 6.20 Downgrade: Requires Battery + Magic Memory Stick

You cannot downgrade PSP firmware 6.20 (or any version) without a Pandora Battery and Magic Memory Stick (MMS). This is a hard technical requirement for the classic "1.50 kernel" downgrade path on hackable models (1000/2000 non-TA-088v3).

Why Both Are Mandatory

Pandora Battery (JigKick): Forces the PSP into Service Mode at boot (IPL loads from Memory Stick instead of NAND). Without it, the console boots normal firmware—no exploit entry.
Magic Memory Stick: Contains the IPL (Initial Program Loader), 1.50/3.71/5.00/6.60 kernel, and installer (e.g., Hellcat's Recovery Flasher, Time Machine, Universal Downgrader). The PSP reads this instead of internal NAND.

Model Compatibility Check

Model	Downgrade Possible?	Notes
PSP-1000 (Fat)	✅ Yes	All motherboards. Easiest.
PSP-2000 (Slim) TA-085v1/v2	✅ Yes	Early Slims. Check date code before 8C.
PSP-2000 TA-088v3	❌ No	Hardware IPL check blocks Service Mode. Permanent CFW impossible.
PSP-3000 / Go / Street	❌ No full downgrade	Only temporary CFW (LME / PRO) via Infinity installer on 6.61. No 1.50 kernel.

If You Have a Hackable Model But No Tools

Buy a pre-made Pandora Battery + MMS (eBay, AliExpress, modding shops) — $10–20.
Make your own: Need a second hacked PSP (friend, local modder) to create MMS via Rain's MMS Maker and convert a battery via Pandora Battery Creator.
Softmod 6.61 → Infinity (Current Best Path): On any PSP (including 3000/Go), update to 6.61 (official), run Infinity 2.3 installer → permanent CFW (survives cold boot). No Pandora needed. This is the modern standard.

Warning

Classic downgrade to 1.50 is obsolete. Modern CFW (6.61 PRO-C2 / LME-2.3 / Infinity) runs all homebrew, ISOs, PS1 games, plugins on any model without downgrading. Use Infinity instead.

Sony PSP