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I solved the problem
https://www.kodewerx.org/forum/viewtopic.php?f=17&t=7347
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Author:  DarkLegend [ Thu Jul 08, 2010 12:24 pm ]
Post subject:  I solved the problem

I have a PSP with Custom Firmware.
It has 5.50 GEN-b(full) and I want to get it to 6.30 Official firmware. I already tried downloading the EBOOT.pbp file and running it, but somehow 5.50 GEN-b is version "9.90" -.-

Anyone know what to do?

EDIT:
I figured it out, its fairly easy to do.

Set your psp so that when you plug it in it reads the flash0 so you can edit it.
Open the folder called Vsh
In one of the folders you see now, there's a file called version.txt (yes, seriously.)
Open it and on the first line change the version (x.xx) to something lower than you want to update it to.

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