1. Power down the phone.
2. Plus a microUSB to the PC.
3. Now plug the smartphone to the PC via the microUSB. Press-hold Volume button while you do.
4. Release Volume button when the Boot mode starts.
5. Use Volume buttons to select the Recovery option.
6. Wait for the Android logo to appear and press-hold Power button for 2 seconds. Then press Volume Up button.
7. You now should be in Recovery Mode. Done.