You need to get (buy) a pandoras battery that will unbrick your psp (datel battery).There are guides google (unbrick psp) that will help you to unbrick your psp , you could try to downgrade using pandoras battery and install custom firmware (backup your firmware when its says to) and then install sonys firmware if you want :P
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If u r trying to update ur psp by any umd in this firmware, It may not be possible so all u have to do is download the update file(official update whichever version u like) and copy it inside a folder named UPDATE, the UPDATE folder should be inside a folder named PSP. The folder PSP could be found at the front(root folder) or when you open ur psp drive by using a computer... NOTE: a)Do not cancel or switch off the psp during update... b)Do not rename the update that you have downloaded...
psp firmware is corrupted, you be need to continue thats update.. 1. update via UMD, the umd that are use must have same firmware version or higher (5.03). check it in other psp. make sure you have a fully battery, then turn on psp.
2. update using sony media go, it a pc client for sony device.. connect psp to pc via usb cable, you will need a internet connection on pc. and it will update to the latest version - 5.51.
alright turn off your psp by holding down the power switch for atleast five seconds. when it is turned off hold down the right trigger (the R1 button) then at the same time hold down the power switch button to get to the recovery menu. after that go to configuration then somewhere amongst all of the displayed lines one of them should either say no umd or umd required toward the end of the text. if it says umd required change it to where it says no umd. then go back and go to advance then advance configuration and disable all and this should solve your problem. hope i helped.