Xbox code is signed (none of the old exploits work either and I doubt there will be any new) and only JTAG machines can hack the original xbox emulator (would be JTAG users reading you actually have to install a hacked xbox 1 emulator- it is not part of anything freeboot does).
I will also mention even on a JTAG machine the homebrew does not work so well- many games have the emulator specially tweaked to work with it and homebrew has a nasty habit of pushing things to the limit.