HOW TO HARD RESET NOKIA LUMIA PHONES

1.First of all, power off the phone by using the Power button.

2.In the next step press and hold the VOLUME DOWN (-) key then

3.plug a usb cable or charger,you will see something like this

4.Quickly press VOL UP(+), VOL DOWN(-), POWER KEY, VOL DOWN (-).

wait until you see something like.......

Then You are good to go