iphone Xs does not respond
My screen is black, my phone vibrates when I press the side button and the volume down button but there are no screen changes.
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see the process below, using the Update option if possible.
Work all through it. There are several stages.
If your iPhone, iPad, or iPod touch won't turn on or is frozen - Apple Support
There is no guarantee you can save any data since your last backup if you need to use the Restore option.