How to create backups of the EFS folder on Samsung Galaxy S5
In Samsung devices much of the information for each model is usually stored in a folder called EFS: MAC, IMEI, product number, system ID and more are stored there for use by the direction system. So, let's see how to create a backup of the EFS folder to have those data safe and recover in the event that they are damaged.
For this procedure we will assert a terminal emulator, so we can download any of the great tools out there for Android. A well known and Terminal Emulator is very good, so we will rely on it for our tutorial. So, let's begin:
Finish Emulator unloaded from
Google Play and Samsung Galaxy started in S5.
When you see the prompt I typed "su" (without the quotes) to the application requests permission to root us. The grant.
Execute the following (again, without the quotes): "dd if = / dev / block / mmcblk0p12 of = / mnt / sdcard / efs.img.ext4"; "Dd if = / dev / block / mmcblk0p13 of = / mnt / sdcard / modemst1.bin" and "dd if = / dev / block / mmcblk0p14 of = / mnt / sdcard / modemst2.bin"
Now we will see the following files in the root of the internal memory: "efs.img.ext4" (20 MB); "M9kefs1.bin" (4 MB); "M9kefs2.bin" (4 MB) and "m9kefs3.bin" (4 MB). What we have to do now is copy these files to a safe place and have them shelter when we will need to restore them, something that we will soon show how to do.