It is trouble that IMEI lost, the call function completely failure, sim card cannot identify. It often occurs after update firmware, sometimes imei failed to register.
To MTK phone, there are ways to modify or writer a IMEI number
Fisrt way, IMEI Tool
Download ere>>
1. Run dos.cmd
2. Input
imei.exe IMEI1 IMEI2
(Please note the blank space, your imei numbers replace IMEI1/2)
Then a document named �MP0B_001_NEW� will be create in the catalog
Change its name to �MP0B_001�
Use root explorer copy the document to replace �/data/nvram/md/NVRAM/NVD_IMEI/MP0B_001�
Restart your phone to take effect!
Second way, SN writer tool
Support MT6517 MT6589 MT6573
Download Link����
https://disk.yandex.com/public/?hash=atm2synTrcuU/MacX9zPng5vGGjJYNsg4vSebBzlQ9s%3D