1. Hello. Please press the Power button to turn your phone on.
2. Now press & hold the Volume Down and Power button for a few seconds.
3. Let go of these buttons when a new menu shows on screen.
4. Use Volume buttons to select Reboot to Bootloader. Confirm with Power button.
5. Use Volume buttons to select Reboot to Recovery Mode. Confirm with Power button.
6. Good job, you are in Recovery mode. Navigate it with Volume buttons; select options with Power button.