How To Backup EFS Folder in Samsung Android Devices

Every Samsung Android devices comes with the infamous EFS folder. So, what EFS folder have and why backup is very important here?
EFS folder is the very sensitive system folder that contains Phone-specific information such as the IMEI (encrypted in the nv_data.bin), wireless devices MAC addresses, product code (also in the nv_data.bin), and much more. If this thing not handled properly, can turn your device completely useless as it will no longer be recognized by your carrier.

Problem is, flashing custom ROMs sometime can corrupt contains within EFS folder. That’s why backing up EFS folder is very important if you love to flash new ROM. Good thing is, XDA Recognized Developer lyriquidperfection develop a tool that can backup and restore ‘/efs’ folder of your device easily called EFS Pro. No need to say, this tool require a rooted device. EFS Pro tool rightly called an advanced ‘/efs’ Backup, Restore and Repair tool.
EFS Pro Key Features
  • Supports Backup and Restore of Partition Image (*.img) and Compressed TAR Archive (*.tar) formats.
  • Automatically detects saved EFS Backups on Device and PC for hassle free restoring.
  • Re-Scan option to refresh Backup list for restoring Backups.
  • Automatically Re-Mounts ‘/efs’ folder with Read/Write permissions during restore for users ‘stuck’ with Read Only permissions.
  • Automatic detection and prompting of Mass Storage Mode.
  • Automatic detection and termination of SAMSUNG Kies application on startup.
  • Supports Multiple Backup handling.
  • Option to Format ‘/efs’ partition before restoring an EFS Backup.
  • Displays various Device, ROM and BusyBox related information on startup.
  • Attempt NV Recovery – Restores NV Data from ‘*.bak’ files if they exist to fix corrupt or incorrect IMEI number.
  • Repair NV Data – Repairs NV Data file ownership to fix ‘Unknown Baseband’ and ‘No Network / Signal’.
  • AUTOMATIC ‘/efs’ partition location detection to add support for many more including future devices.
  • Hashing of Partition Image Backups to verify the data written.
To use this tool, just connect your Samsung devices with your Windows computer and make sure your device is NOT in Mass Storage Mode or Backup and Restore functions will fail.
Now, run EFS Pro.exe file and follow the onscreen instruction to backup or restore your device’s ‘/efs’ folder.

Note: This tool require Microsoft .NET Framework 4.0 and can only work on Windows XP, Vista and 7.
As always, don’t forget to visit official development page to donate the developer as well as download the latest tool.