If you do not have a Pandora Battery and MMS, make one.
To make a MMS, use Pandora Deluxe. You will be able to make a MMS using your Desktop and a MS Reader, no PSP required.
To make a Pandora Battery, run HellCat's Recovery Flasher v1.60 and scroll all the way down to the Make Battery Pandora option and select it.
Now turn off your PSP, insert the MMS, and then insert your battery and it will install 5.00 M33-4.
Now just upgrade back to 5.00 M33-6 or 5.50 GEN-D2 if you want.
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