Ok first off since this completely changes ur biosLD u dont need ur old files.
Change xboxrom.bin back to its original name M8_Bios_Plus_1.6.bin.
Remove the files in ur BiosLD folder.
Add boot.cfg, M8_Bios_Plus_1.6.bin, and default.xbe
Run Default.xbe through ltools again.
Also make sure the directorys and file names are correct In your "boot partitions and executibles" on ur .bin file.
change dvd back to default.xbe.
If this dosent work check out this tutorial
Dont have to follow it step for step as your not installing uix.
But it does explain the biosLD setup a little differently.
Change ur igr method to more compatible just to be safe(donsent have much to do with ur bios loading at all but it might help)