Apple Watch Series 3 won't update
I just purchased a secondhand Apple Watch Series 3 for a friend. It's a little older so it had to update before activating, so it upgraded to WatchOS 6.3 (presumably before updating again) but then it just freezes up and tells me I have to update my phone's OS. I am running the most recent iOS, so that can't be right. Is this a problem that can be fixed or am I gonna have to wait for another update of iOS to fix this? Because right now I have an effectively useless watch that won't pair with anything.
Apple Watch