I had no problem updating everything except the controller via the app, then I hit that same error. I just broke down and used the DJI Assistant and it upgraded no problem...
I had this problem as well. I turned off the bird, turned off the controller, closed the DJI GO 4 app, then opened them back up in succession. That worked for me.
It occurs if you have an old version of the app and after an alert to upgrade firmware, you attempt it. Fix is easy, upgrade app, turn off drone, controller and take app out of memory. Turn everything back on, start app then do the upgrade.
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