1.Download MTK master and install to mobile phone, click to open "MTK master".
2.On the page, you can see the information of this
machine , including the serial number and IMEI code. Click the button in the upper left corner of the software to open the left menu bar and click "system tools".
3.Click "modify serial number" and input 14 digits or target serial number according to the instructions. Click "OK" and restart.
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