First thing we do recommend after rooting device is EFS backup
Help to preserve and restore the image of EFS partition:
* Need Root
For Windows
* Extract from the archive, connect the device to the USB debugging mode (System settings/Developer options/USB debugging) and run selected .bat (depending on the backup or restore)
* To retain the image of efs.img must be in a folder with Restore_EFS.bat
For Linux
For MACOS
* Extract from the archive, connect the device to the USB debugging mode (System settings/Developer options/USB debugging) and run RUN_ME into terminal (double click), select option...
What is EFS, Why it is necessary to backup
Backup/Restore EFS data of Samsung GN2, to Fix IMEI and SIM not detecting issues
What the hell is this EFS ?
EFS partition is actually a internal place in our android device such as android phone which contains some important and some basic info related to our device identity like Wi-Fi address, Bluetooth MAC address and the very main IMEI address (nv_data.bin).
Now if this EFS partition accidently corrupted then your phone’s IMEI no. will erased and you can not make voice call further. This kind of damage is often not accepted by the service center of your respected handset’s company.
Why should I backup EFS data ?
As said above if any case you corrupt EFS then EFS backup can be savior for you.
So it is very necessary to make a backup of this EFS partition just now to avoid such type of future troubles.
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