Apple iPhone XR gets stuck on update. Usual reset (quickly press and release Volume Up, quickly press and release Volume Down, press and hold side button) doesn't help.
I found this issue on apple forum unanswered with a lot of people having it:
Apple iphone XR frozen during software update. Unresponsive during reboot try. Black screen with Apple Logo . Can not even reboot. What is the Next step ?
So I decided to provide an answer here which I've got by chatting with Apple Support.