When I discovered that once I backed up
17.0.3 to icloud you can never go back to a lower ios number such as 16.7,
So I then did visit youtube which wasn’t very helpful, but I did connect my iphone to my Mac computer and Mac did allow me to use some type of a download (I’m skipping a lot of confusing steps here).
My next plan of attack was to make a factory reset like with my old iphone XS.
That didn’t work either. Since iphone 13 pro max doesn't have a factory reset, just an app reset.
So my next plan of attack was to delete actually not delete but offload any app that didn’t come originally with the iphone when I bought it at the store.
This did something what? I’m not sure?
This didn’t fix the phone either, but after attempting several FaceTime calls to a friend, some how it worked?
Turn the Camera on and off, and back on
Turn FaceTime on an off and back on
I never tried the clock thing.
But today the iphone seems to have fixed itself and I can now make FaceTime calls.
Sorry I can’t be more specific about ios 17.0.3 but it seems to be a good ios.