If your device is still fully functional—meaning it powers on and you can use it—then you should be able to factory reset it from the Settings menu. The process is very similar across all manufacturers, but keep in mind that the wording may vary slightly between Android phones.
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The first thing you’ll need to do is head into the Settings menu. Swipe down once or twice from the top of the screen and tap the gear icon in the notification shade
In the Settings menu, scroll down to “System.” Samsung owners should look for “General Management.”
Expand the “Advanced” section if you need to and select “Reset Options.” Samsung owners will see “Reset.”
Now look for “Erase All Data (Factory Reset)” or simply “Factory Data Reset.”
You’ll see a warning to let you know that this process will erase all of your Android phone’s or tablet’s internal storage data. Tap the “Erase All Data” or “Reset” button.
Enter your lock pattern, PIN, or password to confirm you want to reset your phone and then tap the button one more time to complete the process. There’s no going back after this.
The device will immediately reboot, and the “erasing” animation will show up. After a brief period, the Android phone or tablet will reboot itself a final time and prompt you to complete the setup process.
While factory resetting your device will completely wipe the internal storage, it’s worth noting that the SD card may not be included in that. This will vary between devices, but if you plan on selling or otherwise getting rid of the device, it’s recommended to either remove the SD card completely or format it on the PC first.
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