So you want to downgrade your firmware.
This downgrader is for v3.50 firmware, and includes a port of the Homebrew ENabler (HEN) for firmware 3.50. It will automatically detect all known PSP motherboard types, and do the appropriate steps to ensure a safe downgrade.

As always, there is a risk when downgrading your PSP’s firmware.

Downgrader for PSP v3.50 firmware by Noobz

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