Apple Releases Apple Fitness+, macOS 11.1 Big Sur, iOS 14.3, iPadOS 14.3, watchOS 7.2, and tvOS 14.3

iOS 14.3 update complete. No joy. Still getting the two pop-ups when plugging in the iphone. I notice that the Finder iPhone page still shows iOS version 14.2 and the sync is stuck in step 4. This leads me to believe that the finder is not getting access to some files on the iPhone that it needs.

Updated the iPhone backup password. Manually backed up iPhone to iMAC disk. Sync now completes normally. Replugged the USB connection. Got the two error pop-ups again. Got message that the automatic sync could not be done as the previous sync had not completed (even though it appeared to have). Clicked the sync button and the sync seemed to complete normally.

Tried to cycle the USB cable again. Again 2 pop-ups then a different error " The iPhone "Bill’s iPhone cannot be synced. An unknown error occurred (-50).

I’m stumped, but something seems not right with iPhone to Finder integration.

Any ideas would be appreciated.