Apple logo flashing
What do you do on an iPhone X that just keeps flashing logo can’t turn on or off
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Try things in these links:
If your [iOS 13 or higher] iPhone is stuck on the Apple logo - https://support.apple.com/HT210616
If your iOS or iPadOS device restarts or displays the Apple logo or a spinning gear unexpectedly, click here --> https://support.apple.com/HT203899
If your iPhone, iPad, or iPod touch won't turn on or is frozen - https://support.apple.com/HT201412
If they do not work then follow the advice at the end of the documents about contacting Apple.