iPhone 13 stuck in reboot after 18.3.1 update

"iPhone 13 stuck in reboot after 18.3.1 and during update.. phone has LOGO and the reboot line under it. stuck for nearly 2 hours and not moving"

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Fixing a Boot Loop:

Your iPhone is stuck in a Boot Loop. This typically occurs when you go about installing an update, and it stalled while in the process. Use my User Tip: How to Fix an iPhone in a Boot Loop - User Tip