To perform a basic factory reset of a phone, perform the following steps:
Step 1 Press Applications
Step 2 Go to Admin settings > Reset settings > Reset device
To perform a hard factory reset of a phone, perform the following steps:
Step 1 Press "#" when you power on the phone
Step 2 You will see the headset,speaker and mute will light on and then light off.
Step 3 When you see only headset and speaker turn on again, please press 123456789*0# in sequence.
Step 4 After you pressed the the first digit "1", you will see speaker turn off.
Step 5 After all the number are input completely in sequence, you will see Mute button turns on to indicate phone begin to do the factory reset.