One thought would be use API or bulk creation tool/csv upload to bring in all the MXs and place them into their individual networks. CSV could be as simple as list of serials and generic network names (ex. 1, 2, 3, etc). Create templates for each of the firmware versions. You'd need Support to help set those old versions. Then bind all the networks to the first template to have them upgrade. Once done rebind to next firmware level template. Etc. Example, three templates set to 3 different firmware versions. Support would need to set the older versions as those are no longer public facing/selectable. Org firmware view with example networks 1, 2, 3 bound to each template. My thought is bind all networks to template v.16 let them all upgrade. Once finished rebind to template v.18. Once finished bind to template v.19.
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