Bios Mods -The Best BIOS Update and Modification Source

Hello everyone. The long way making AHCI mode works on my laptop ends after yet another bios modification... I replaced MOD_5100.ROM module with one that has AHCI initialization commands (i guessed so) and added AHCI option rom OPROM6.ROM. flashed as i usual do with phlash16 from DOS. reboot and i got nothing. just blank screen. i tried phoenix recovery with usb stick but vain. tried Fn+B, Win+B, Fn+Esc... nothing works.
Maybe someone more experienced could tell me how to figure out this sad situation.
Any help appreciated!

ok, no answers...

i've connected lpc post card to debug500 to see if bios attempts to load. ok, it does and at code 69 system hangs.
btw, this board boots via lpc. and there's no BIOS chip, BIOS seems to be stored in LPC FWH. it's SST49LF008A-33-4C-EI. somebody could help me with dumping/flashing of it? do i need to desolder?