Instruction I:
1. Look at the back of your phone. Take off the back cover and remove the battery.
2. Take a five seconds long break. Afterwards, put the battery and the cover back in their places.
3. Press the Power button, therefore powering the phone up again. Good job, the soft reset is done.
Instruction II:
1. Hold down the Power button to turn the phone off.
2. Give the device five seconds.
3. Now switch the phone back on by pressing the Power button. You have completed the soft reset.