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As in post#2 "What type of issues are you having?"
As a matter of interest what did you upgrade, drone?, controller?, app? And from what version to what version?
If the drone or controller try connecting them, via USB, to a computer running "DJI Assitant 2 for Mavic" and then refresh the firmware. If that fails to solve problem try going back to one of the earlier versions (if you see that option).
Hi John, welcome. I had the same problem with my Mavic 2 Pro and Smart Controller earlier this year. I did the same thing that PhiliusFoggg is advising in this thread. Once successful, I haven't updated since and all is still good. Good luck. Tom