Did you try to rename that modded BIOS to R0080F1.rom and reinsert it (overwriting the original) into the installer from SONY (AIBSYS-00772903-UN.exe) using 7Zip ? Then run that installer with the modded BIOS in it. It may or may not work so do it at your own risk. Be sure to have a recovery disk with the original BIOS on it ready BEFORE you try that.
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