If your iPhone stuck on Apple logo, you can go nowhere but the flashing or same Apple logo screen all the time. In most cases, when you see an iPhone flashing Apple logo, it means something wrong with the iOS system. The followings are some common causes of iPhone stuck on past Apple logo screen. Check and figure out the real reason to get your iPhone out of Apple logo loop.

iPhone stuck on Apple logo during iOS update
During your iOS 13/14 update, if something interrupts your iPhone/iPad/iPod touch, then your iOS device may get stuck on Apple logo and reboot over and over again.
iPhone stuck on Apple logo after jailbreak
Jailbreaking is a good way to eliminate hardware limitations on your iPhone. As a result, you can download applications that are not available at App Store. However, those jailbroken iOS devices are easily to stuck on Apple logo due to corruption of a file system or data error.
iPhone stuck on Apple logo after restore from iTunes or iCloud
If you disconnect iPhone from the computer during performing a regular restore or reset, which may cause your iPhone stuck on Apple logo.

3 Best Methods to Fix an iPhone Stuck on Apple Logo: https://www.apeaksoft.com/ios-recovery-mode/iphone-stuck-on-apple-logo.html