I'm not sure why it flashes orange then green. Mine never does that.
But you see the cromwell bios so that's good.
You're going to have to get a new bios. You'll find that in the usual places
You're looking for the X-chip 1.1 bios.
You'll need to write that bios on to your chip by the X-control software. Which you can find at http://www.easybuy2000.com
You use the software by connecting the X-chip to your computer by usb cable.
Get Avalaunch, it's a great dashboard, and it'll let you do what you want on your xbox. Find an installer for it from http://www.x-disk.com
. You're looking for Ava_X_net 1.5 or something like that.