Thanks @DeathBringer !
I got the R910 v2.7.7 bios working on ubuntu 16.04. There is a good site for flashing hdr files from ubuntu:
https://major.io/2016/01/18/updating-del...rom-linux/
Bascially:
# it's easiest to be root - su and don't pretend this is safe...
su
# install dell's utility for flashing
apt-get -y install firmware-addon-dell
# enable kernel module for flashing
modprobe dell_rbu
# test modded bios, if it's ok, it may not return anything
dellBiosUpdate --test
# perform update - change name of hdr file as appropriate
dellBiosUpdate -f /path/to/R910-020707C.HDR -u --override-version-check -v --reboot
# system will reboot and update bios
# once system is back up and you login and su,
# confirm bios updated with - output should confirm successful update
dellBiosUpdate --system-info
# if you have problems, check help:
dellBiosUpdate -h