If I use any tool - even phoenixdeco

If I use any tool - even phoenixdeco - to decompile - it says unknown Bios format.There is no info about BIOS manufacturer on screen when PC boots (only RAM size installed, how to enter to BIOS,BOOT order tries and that is all) .
I suppose that it is needed original COMPAQ Bios utility. The original BIOS is distributed with special tool and the BIOS-file is not 256KB ROM binary file but it has parts
1 file about 192KB
couple of 3KB files with international languages.

Anyone has tried to add microcode to such "terrible BIOS"?