As was pointed out in another thread, to update a Sparkfun board you’ll need to use a tool other than the CarbideUpdater.
List of them and instructions on using them here: GRBL 1.1 and Carbide Motion 4
and you can grab Grbl 1.1 hex from the carbideupdater page: http://carbide3d.com/dl/v4/grbl.hex