How to Manually Backup the EFS & NV Data on Samsung Galaxy S5

Hey friends, In the following guide we’ll tell you how to manually backup the EFS & NV data on Galaxy S5

. Every Samsung device store the unique and confidential information such as IMEI, MAC address, product code, system ID and NV data. Sometimes during flashing a custom ROM, the EFS partition gets corrupted, it’ll result in Null IMEI and Not Registered on Network so to avoid these problems it would be better to Backup the EFS and NV Data.

Steps to Backup the EFS and NV Data on Galaxy S5 SM-G900F/T/P/A/I/M/W8 variants:

Step No 1: Download and install the Terminal emulator app from Play Store.

Step No 2: Now open the app and write the following command in the prompt:

su

Step No 3: Now type the following commands one-by-one in prompt.

dd if=/dev/block/mmcblk0p12 of=/mnt/sdcard/efs.img.ext4

dd if=/dev/block/mmcblk0p13 of=/mnt/sdcard/modemst1.bin

dd if=/dev/block/mmcblk0p14 of=/mnt/sdcard/modemst2.bin

Step No 4: After the process is completed, you’ll find the following files in your root of internal storage.

efs.img.ext4 (20 MB)

m9kefs1.bin (4 MB)

m9kefs2.bin (4 MB)

m9kefs3.bin (4 MB)

Step No 5: Now Copy all the files to a secure location on your PC or Laptop.

Steps to Restore EFS on SM-G900F/T/P/A/I/M/W8 variants:

Step No 1: Download and install the Terminal emulator app from Play Store.

Step No 2: Open the terminal emulator app and write the following command in the prompt:

su

Step No 3: Now copy all the EFS backup files to the root of your internal storage.

Step No 4: Now execute the following commands one-by-one:

dd if=/mnt/sdcard/efs.img.ext4 of=/dev/block/mmcblk0p12

dd if=/mnt/sdcard/modemst1.bin of=/dev/block/mmcblk0p13

dd if=/mnt/sdcard/modemst2.bin of=/dev/block/mmcblk0p14

Step No 5: After all the commands were process successfully reboot your Galaxy S5 to apply changes.

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