I have this problem also. My Mac is a 2014 MBP and both USB ports are dodgy. Once I plug the cable in and connect the phone the iPhone will alternately/not show in Finder. About every second. If I put my iPad resting on the actual cable at the USB plug end, just past the strain relief, all is good and I can update with IPSW.It’s a OEM….
Could well be. Although my Mac did have me install an "update" (not OS) prior to being able to sync and update the iPhone. Now, I am stuck on Big Sur, so that could be the reason for the "update" on my Mac.It's got to be the IOS, worked perfectly fine prior to the other day, until I tried to make a physical backup on the mac.
I think now it is the macOS. The problem started after 12.2.1 was updated from 12.2
Honestly a can of compressed air will usually clean it out.Tried it once. What is most effective way?