There are a few ways to do a tablet factory reset, but the most common way is to hold down the power button and the Volume up button at the same time until the device restarts. From there, you'll need to navigate through the settings menu and find the option that says "Wipe data/factory reset." Tap on that option and then follow the on-screen instructions. Be sure to back up your data before doing this, as it will be erased when you reset the tablet