What is EFS, Why it is necessary to backup
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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.
Now the question is “how to make a backup of EFS partition”.
There are three methods to make a backup of this EFS partition.
OP is best tool
to make backup/restore of EFS for Note2 Thanx to as i9100.
2nd EFS folder backup using root explorer
Just copy the whole EFS folder via root explorer to your SD card or anywhere in your PC.
But according users criteria this method is not be good in EFS restore.
Using of a backup/Restore tool mentioned in OP will backup your whole EFS partition including read / write permission that makes your phone compatible for this task.
Source : Androidflip.com
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