1.Hold Power button to turn off the phone.
2. Now, press and hold Volume Up + Power key for a couple of seconds.
3. When a new menu appears on the screen, release held keys.
4. Next, choose Recovery option, by using Volume Up to navigate and Volume Down button to select.
5. Now hold down the Volume Up and Power button for a few moments to see the Recovery Mode menu.
6. Good work, you now should see the Recovery Mode menu.
7. Navigate the menu by using Volume Down and select options by using the Power key.