To change xecuter2_4978.3 dash,boot,etc.Get xbtools 1.0.8b19 load up the bios ,now go to the tmp dir in your xbtool
and copy 4 files,yes this bios has an extra file fbl.img in it.Copy
these files in to another dir ok.Now use hiew dos hex editor to
edit the xboxkrnl.img to boot from different dash drive etc and save,now go back and delete the files in tmp folder of xbtools
and copy the edited files back to in to tmp folder in xbox tools dir.Note do all this without quiting xbtools ok.
Now just do normal save bios in xbtools ,dont click on any options for now just save ok.
Ok now quit xbtools,run xbtools again now load up are saved bios back, now you may change options led,etc ,but do not tick
bfm box ok,save your bios back in a different name,quit xbtools 1.0.8b19.
Now get xbtools 1.0.8b16 or 15 and run it load up the edited bios we saved early on,once opened go in to the tmp dir
in xbtools 1.0.8b16 or 15 an you will see only 3 files this time
now rember fbl.img one of the 4 files we saved earlier copy only this file in to the tmp folder,leave the others alone.now
tick bfm option and save.You have just got yourself a bfm xecuter2_4978.3 bios wich can now boot from any dash and drive,etc.
This bios boots great with PBL1.3.5i and other un suported bioses with this method as well ok.
PS:If you try things even a poor man's dream comes true.