I have a 1.6 (not sure if it is a

and I'd like to remove all images and sound on boot.
I was able to do this to a 1.0 like this:
- 256k chip (aladian xt+) same chip I have on 1.6
- changed Xecuter2.4981 using XBtool
- flashed using eurasia_pro_generic_flash_disc_1_2 + custom bios disk
I have a couple more xboxs I want to do this to and I'd love to be lazy and modify m8+ and just put it on all of them; but, that doesn't seem possible.
I can't even figure out if I can do this at all on a 1.6 or not.
Can anyone tell me if I can make a black screen, silent booting 1.6?
Thanks!