IMEI TOOL SAMSUNG Note4

Requirement Rooted Samsung Galaxy Note4 SM-N910U/F/K/C/L/P/T/G/H/0/W8/N915G (edge) support for other variant of Note4 will be added soon.

It is small utility to backup/Restore EFS for Smamsung galaxy NOTE 4

Features
This tool simply Backup/Restore efs.img, partitions.

Installation
-You must have device ROOTED.
-Enable USB debugging
-To make backup - select your model variant (Exynos/Snapdragon)
From next screen you have to long press backup option icon, Backup files will be stored to MyEFS folder as well MyEFSbackup/myEFS_mm_dd-yyyy-hr-mm_Device IMEI folder on Int SD card. This will make backup of required partition Also you will found build.prop file in backup folder, which is just to get information about your ROMwhile backup was created. Also last backup will be saved in MyEFS folder on IntSD card
In case you select wrong model from menu backup won'tcreate and you will get notification about this. from same screen you will have option to mail to developer for issue.

-Auto backup - This is experimental feature. You can enable/Disable it from Backup/Restore menu page (according exynos/Snapdragon). Selecting this option will make auto backup on Every Tuesday between 5.00am to 5.30am according your device model.

-To restore, This will use last backup stored in IntSD/MyEFS folder. Make sure this folder contains required files. In case you needs to restore earlier backup, you have to manually keep older backup files to IntSD/MyEFS folder.

Note : This application is not for just playing around, DON'T restore just to check/test application, Restore option must be used only when you really needs it.
If you don't know what is EFS and why you needs to restore, Don't use it. Read XDA thread for further info.
http://forum.xda-developers.com/showthread.php?t=2420881

We can't guarantee this will surely works on every case, you can use at your own risk. Also note that you can restore only backup which you have made on same device only.