It is small utility to backup/Restore EFS for Smamsung galaxyNOTE 3 N9005.
Features
This tool simply Backup/Restore efs.img,modemst1 and modemst2partitions. As we know On N9005 (qualcomm) IMEI number no morestored on EFS partition so no meaning to make backup of onlyefs.img. you must have backup of modemst1 and modemst2 partitiontoo. This tool will backup all three partitions.
Installation
-Needs Rooted device
-Enable USB debugging
-To make backup you needs to long press backup option icon, Backupfiles will be stored to MyEFS_mm_dd-yyyy-hr-mm_Device IMEI folderon Int SD card. This will make backup of all three requiredpartition efs.img.ext4, nvrebuild1.bin and nvrebuild2.bin. Also youwill found build.prop file in backup folder, which is just to getinformation about your ROMwhile backup was created.
-To restore, you have to first copy all three backup files(efs.img.ext4, nvrebuild1.bin and nvrebuild2.bin) to root directoryof Int SD card. Once all three files there on int SD card simplylong press Restore EFS option icon and reboot device.
Note : This application is not for just playing around, DON'Trestore just to check/test application, Restore option must be usedonly when you really needs it.
If you don't know what is EFS and why you needs to restore, Don'tuse 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 canuse at your own risk. Also note that you can restore only backupwhich you have made on same device only.