Recovery is included on a separate partition from the main Android OS on all Android devices.
You can boot directly into recovery mode and use it to factory reset the device, delete the cache partition, or apply software updates. It can help you fix your device.
1. Let's get started, first turn off your phone.
2. Now press and hold combination of buttons Volume Down key + Power button.
3. Wait untill Factory data reset menu will show on your screen, and you can release the keys.
4. And that's it. To move around the menu use your volume buttons and to select press power button.