Unlike Zebra devices, for most Android brands, device firmware upgrade is done via utility app accessing the OEM firmware upgrade server directly.  Most MDM solutions can only enable/disable this upgrade procedure.

There is thus no general approach for downloading a zipped firmware image to an Android device for subsequent firmware update.  If the brand of device you are using supports such function, you should look into the corresponding documentation from your device vendor on the details about how to do it.

If there is an ability to perform an update check via a button in the settings menu, you can adb log the intent and then trigger it with a script.

If you are able to download the update i guess there should be an option for you to apply it "offline".

And that you can most likely automate atleast a bit.

Hello Josh,

Thank you for the question.

Can you please mention the manufacturer of the devices in question.