Hard Reset CHANGHONG Feature Phone M638

How to factory reset CHANGHONG M638? How to wipe all data in CHANGHONG M638? How to bypass screen lock in CHANGHONG M638? How to restore defaults in CHANGHONG M638?

The following tutorial shows all method of master reset CHANGHONG M638. Check out how to accomplish Hard Reset by hardware keys and Vendor settings. As a result your CHANGHONG M638 will be as new and your core will run faster.

  1. Switch on the cell phone.
    Remove Screen Lock on CHANGHONG M638
  2. Press this in sequence: *#77218114# or *#881188# or *#94267357# or *#9426*357# or *#19912006# or *#118811# or *#3646633#
  3. Wait until your phone restarts.

Help! This doesn't work