iPhone won't sync via USB

Tech Support
1

Since I upgraded my iPhone 13 Pro to version 18.5 I can no longer sync contacts via USB connection.

I get an error “could not be synced because the sync session failed to start.”

I won’t use iCloud. I sync by hand from my Mac Mini to my portable devices as I choose.

My calendar is on my own personal NAS server with a CalDAV connection and I really don’t have time to implement a CardDAV connection right now but I WILL NOT use Apple iCloud for this critical data.

I’ve rebooted, tried different USB cables but still no sync. Any suggestions?

2

How are your contacts stored on your NAS?

3

They aren’t. I could do it with a CardDAV server but I don’t want to take the time to do that. I do use a CalDAV server for my calendars.

4

This isn’t 18.5 specific, but you could try resetting Location & Privacy on the phone. If you use something like iMazing, it has a couple options to reset/restart the relationship between the Mac and the iPhone.