If your S7 encounters a problem during an OTA (over-the-air) update and got stuck in boot loop, you can, revert it to its previous operating system version, provided you know the exact firmware build.

Boot Loop Causes The core problem found in a boot loop is a miscommunication that prevents the Android operating system from completing its launch.

Problem 1: Galaxy S8 Plus got stuck in boot loop, Android won’t boot up I just recently purchased Samsung Galaxy S8 Plus 2 weeks ago.