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Now if there was a truly all version bios then would of thought evox would of released it by now
For modchips and tsop's there isn't because of the hardware initialization process (I think), or simply for the reasons LordVader stated.
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there was a very very early leaked release of the evox m8 bios that was very beta and could damage 1.6's - think a certain modchip manufacture leaked this out and caused a bit of bitching - but there was a big warning from evox about using the leaked m8 beta bios.
It was hamptitampti of the SmartXX team (I think that's how you spell his name). I did read a few posts on their forum from people who wanted money to buy a new Xbox because the beta M8 fried their shit.
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Not wishing to put the fear of god into anyone but if you use the m8 bfm bios on mod/tsop then you do so at your own risk
quite possible it may be ok as many have reported but for the moment I'm sticking with the tried n tested bios's that were made/recomended for my older mobo's
Yea, that sounds like the best thing to do. For older mobo's the M8 BFM doesn't have any features that aren't available in other bioses, plus the older ones are easier to edit, so it would just be better to stick with those. For 1.6's, well most modchips have multiple banks so you can flash the official M8 to one bank, and then the BFM M8 to another just in case it doesn't work for some reason.