14.4 update - iPhone stuck on Apple logo

Try things in these links:

If your iOS device restarts or displays the Apple logo or a spinning gear unexpectedly - 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 links about contacting Apple.

Hey guys this is Anirban and I am from India. I recently changed my XS MAX with the latest 12 PRO MAX. But since the day I purchased the device I am facing this issue regarding the flashing apple logo during reboot. I tried every possible solution to fix this, but unfortunately nothing worked. I called up the apple customer care and they informed me that it is an issue with the recent IOS 14.4 world-wide. He requested me to kindly wait till the next IOS update. And also said that replacing the device may not be able to fix the particular issue. I would request every victim of the same issue to wait till the next IOS update.

This also happened to 2 other people I know... What a bad software... You will need to factory reset the phone via iTunes.

I hope you have backup...