I did the HP 2.1 mod myself, and the laptop worked fine with it. I wanted to replace the Wi-Fi module with a more modern one.
noWhiteList 30CFF34A.WPH : in BIOSCOD02.ROM 0000466Fh: F9 replace with F8 30CFF34B.WPH : in BIOSCOD04.ROM 00003B51h: F9 replace with F8