"Unable to activate" an update is required to activate your iPhone 7
I've updated the iPhone 7 to the latest software (15.4.1), I've reseted it, and I have checked the SIM card to make sure it's undamaged but nonetheless I still get the "No Service" on the top left and when I go to active the iPhone it doesn't allow me and I get the "Unable to activate" an update is required to activate your iPhone" message. Does anyone have a clue as to what the issue might be?
iPhone 7, iOS 13