Samsung Galaxy A51 - Restart Device. Here's how to restart your Galaxy A51 if it crashes and resets, freezes or runs slowly. Tweet Factory Reset Hard Reset Samsung Galaxy A51 - Wipe All Data / Factory Reset - video How to Hard Reset SAMSUNG Galaxy A51 - Remove Screen Lock by Recovery Mode - video WARNING ! Hard Reset will erase all of your data. All described operations you are doing at your own risk. Help! This doesn't work. Check other SAMSUNG device solutions: Samsung Galaxy A51 Factory Unlocked I show you how to fix a frozen screen, unresponsive screen or you can't restart on a Samsung Galaxy A51. Hope this helps. WorldofTech. I show you how to turn off (shut off or power down) or restart (reboot) the Samsung Galaxy A51 from the power off menu. Hope this helps. V5xRMl.