Here are the 4-methods to change IMEI on any Android device. This methods will work most of the devices. If you lost your IMEI number, then you will loose Network signal. You may facing this issue while rooting your device or Upgrading OS or Installing Custom ROMs.  Below guide will help you to fix IMEI or Invalid IMEI or even you change the IMEI number temporarily. These methods are working with or without Root Android device.
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