The Galaxy S8 is a great phone, but sometimes you're put in a position where you need to bring it back to the state you found it, be it for performance reasons, bugs, or to sell. Whatever the cause of the reset, it's fairly easy to do it. Here's how: How to factory reset the Galaxy S8 from inside Android The easiest way to factory reset the phone is to do it from within Android. But before you do anything so drastic, ask yourself a couple of things : Have you backed everything up? Have you tried every other course of remedial action, such as deleting an app suspected of causing slowdown? Have you called technical support to work through the problem with Samsung directly? If you've answered yes to all those questions, you may proceed. From the home screen, swipe down on the notification shade . Tap on the Settings button (looks like a gear icon). Scroll down and tap on General management . Tap on Reset . Tap on Factory data reset . Scroll down...