Any bios that will work on your version of xbox. The bios isn't the issue here. If you're trying to boot from the HD, and said HD is blank
.... well, see what I mean?
Install the MS Dash like I said to get rid of error 16 (lack of dash). Since you flashed your TSOP, you're not going on Live and can't turn OFF the mod (unless you installed a switch
), so you'll never need to lock the HDD, as it's only required for booting the MS Dash with a mod disabled or to go on Live.
I recommend x2.4981.06 bios, as you clearly don't have a 1.6 xbox and thus don't have to use the Evox M8 bios. x2.4983 is the latest, but it can't be edited (to remove the flubber animation, change the logo colors, etc), so I prefer xs.4981.
Again, it ain't the bios. It's the fact that your HDD contains no dash (MS or otherwise).
Either get Slayers, or make yourself an Evox bootdisc
and get a dash on that drive.