You should decrypt your own using your PSP.
Get the 3.02 firmware (Eboot.PBP):
here
You will need to extract the DATA.PSAR from the Eboot.PBP
You can do that with PSPBrew:
here
Copy the DATA.PSAR to the root of your MS
Get a copy of 3.03 PSAR Dumper:
here
Copy it to your GAME150 directory
Launch the PSAR Dumper
Use the X option button to decrypt the firmware, wait until its finished.
This will create a F0 directory on the root of your MS with the files you are looking for.
Follow the rest of the instructions in the DAX readme.
You do not need to keep the F0 folder on the MS.
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