is it possible to dump a version 1.1 original bios using a homebrew mod ...

I wondered if I boot an EVOX Boot CD with a X2 homebrew attached ... then disable the homebrew and choose "Backup settings" which BIOS will this backup - the TSOP or the memory resident X2 Homebrew?

I can't try this as I already flashed the new XBOX but wanted to make a split bios Original/X2 but can't seem to find any original bios files for the 1.1 in "the usual places" so it got me thinking - is it possible to dump the 1.1 ???