My iPhone X keeps flashing the apple logo on a black screen, how do I fix it?
My phone is stuck on a black screen and keeps on slowly flashing a white apple logo. How can fix it?
iPhone XS, iOS 14
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Logo Bootloop
see the process below. Work all through it.
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