That worked! Despite what the manual said, I had to upgrade the drone using the .bin on the microSD card, before upgrading the controller via the app, but now it all seems to work.
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I got a 3 Pro from a friend. It may have had a crash (waiting to hear back) as one of the propellers was slightly damaged. I replaced all 4 with new DJI propellers.
Booted everything up (after reading all the manuals) and had to do multiple rounds of controller updates. Now overall status is...