How to Downgrade a PSP to the 1.50 Softmod
You can downgrade a PSP to firmware 1.50 with a service tool. Using the service tool, the PSP can be soft-modded to run PSP firmware 1.50. On firmware 1.50, the PSP is free to have other firmware installed on it and have games installed on the PSP's internal storage chip. Service tools go by many different names, including Datel, Pandora and Jigkick batteries.
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Instructions
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1
Turn the PSP on its face and remove the battery cover. Pull the PSP battery out.
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2
Insert the MMS into the PSP's memory card reader and insert the service tool into the PSP. Turn the PSP on while holding the left trigger button to see the service menu.
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3
Press the "X" button to downgrade the PSP's operating system to 1.50. Press the "X" button to reboot the PSP after the downgrade completes.
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4
Remove the service tool and MMS and replace them with a normal PSP battery and memory card if you so desire.
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5
Turn on the PSP. It is now running 1.50 firmware.
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Tips & Warnings
MMS stands for magic memory stick. These are usually sold along with service tools or sold separately.
Make sure you purchase 1.50 service tool bundles.
