Sparkfun SO3: Firmware backup before GRBL1.1 upgrade?

Is there an easy way to create a backup of the currently running firmware on the Stepoko controller board of the SO3 Sparkfun Edition? I would like to try the upgrade to GRBL 1.1 but would like to have a version of the currently running firmware in case that doesn’t work. I couldn’t find hex file downloads on the Sparkfun webpage for this controller.

This should be Grbl 0.9: — if not, there’s a Drop Box link and further instructions at: GRBL 1.1 and Carbide Motion 4

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