This tool dumps and decrypts the 2.80/2.81 firmware files from "data.psar," found in the 2.80 & 2.81 EBOOT update.
Other files:Unpack "data.psar" from the 2.8x firmware update using PBP Unpacker. Copy it to the root of your PSP's memory stick.
Load Dark_AleX's modified psardumper onto your 1.50 PSP and run it!