iPhone 16 Pro Max is stuck on software update

See this article.

If your iPhone or iPad won't update - Apple Support

“New IPhone stuck on software update: New 16 pro max is stuck on software update for 20mins. Please help”

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Fixing a Boot Loop:

Your iPhone might be stuck in a Boot Loop. This typically occurs when you go abuut installing an update, and it stalled while in the process. Go here to fix that: How to Fix an iPhone in a Boot Loop - User Tip