If you have flashed a wrong Custom ROM or do other tricking on your Android Device, it might result to Unknown Baseband and Invalid IMEI.
The goodnews is that the 100% fix is here.
This method worked wonderfully well on MTK Devices and Tested on Android 6.0 Marshmallow, you can equally try it on Lollipop too.
Download Es File Explorer from HERE
Rooted MTK Device (learn how to root your device here)
Download and install the Es File Explorer and grant root access to it.
Open the App and click on option key. Scroll down and grant access to Root Explorer and Show Hidden Files
Now click on ‘Device‘ -> ‘Data‘ and delete “NVRAM” folder.
Restart your device and check your Baseband – All Fixed.
You can use Chamelephon to change your IMEI to your choice.
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