Fake Updater (psardumper mod)
Since it seems that this moment is the boom of firmware loaders, i have created this litle tool to make things easier.
It's not more than a modified version of psardumper by pspset, with a diferent gui and that instead of writing the decrypted update files to out and outx without folder structure, it writes them to ms:/F0 with the flash folder structure, so yo can load them with a firmware loader that supports decrypted files. (note: you may still need a copy of your flash1. fake updater creates ms0:/F1 and its subfolders but they are empty since the updates doesn't contain any flash1 file)
You don't need anymore to extract the data.psar from the eboot. Simply copy the eboot.pbp of the update to ms0:/PSP/GAME/xxxx/UPDATE/ (where xxxx is the folder where you have fakeupdater).
This program does NOT write to the flash. It doesn't read it also. But it has the strings "flash0" and "flash1" in it, because it redirects name of files in the update from "flash:/xxxx" to "ms0:/F0/xxxx". (paranoics, see the included sources).
The download links: (this is a different version that the one i posted the other day in some thread. that one was based in a slightly modified psardumper 02. this one is based in 02A which has bugs corrected):
EDIT: updated with new files. Now it let you copy your flash1 to ms0:/F1 and let you choose if you want the update files to be decrypted or not by psardumper.