1. Power down the phone.
2. Now press-hold the Volume Up and Down buttons for three seconds. While you hold them, press and release the Power button.
3. Choose the Recovery option - use Volume Down to navigate the menu and Volume Up to select it.
4. Android logo will appear on-screen. when it does, press-hold the Volume Up and press Power button.
5. Voila, done. You are now in Recovery Mode.