1. Download and place all three files onto your Desktop.
2. Extract files from the Fastboot archive over to your Desktop.
3. Turn OFF your device.
4. Turn it back on by holding down Volume DOWN+Power buttons together.
5. Select Fastboot from the menu that appears on your screen.
6. Plug in your device to your PC using the USB cable.
7. Launch a Command Prompt Window on your Desktop. To do that, simply hold down the Shift button and right-click on any blank area on your screen and select Open command window here.
8. Type in following command into the Command Prompt Window. Make sure to replace recovery.img with the actual name of the Recovery Image you downloaded:
fastboot flash recovery recovery.img
9. Once the recovery?s been flashed, reboot your device.
10. You?re done!