How to backup and restore “EFS” folder on Android?

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Catherine Le Nevez
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This is basically it to avoid uncorrectable errors in case some of these processes fail, thus providing insurance. Especially if the person about to perform the procedure is doing it for the first time, which makes it more likely that something could happen.

Then a è always It is advisable to make a backup of this essential file, which will ensure the safety of your computer.

What is the Android "EFS" folder and what is it for?

This folder has an essential function within the mobile phone since has archived some vital data for the computer.



These consist of SIM data, IMEI number, Bluetooth information and MAC number as well as other essential information.

It also saves the ' PRODUCT CODE'  or, better, the product code, and in the same way you can find the SIM UNLOCK.

All these files contained in the folder are essential elements which, if deleted by mistake, can cause irreparable damage.

Why is this? Well, this is the main goal when trying to free a mobile phone or change the Android version or install a ROM.

This is where the importance of generating a backup of the folder lies, in this way it is ensured that such unrecoverable and unique data will be safe.

And if there is a problem during the process and the Android "EFS" folder is corrupted, the computer can be restored without any problems.

If it did not have it, there would be no way to repair the cell phone, causing an irreversible state within it, preventing it from carrying out its functions normally.


Make a backup of the "EFS" folder

Keep in mind that to perform this procedure you must have some experience and knowledge in the area or subject.


Said this, poses a risk if not done correctly, so if you don't have the skill for the task, it's best not to.

Therefore, you can also find someone you trust and who also has experience to help the owner of the equipment back up.

Now, if you decide to start, what you need to do to proceed is to enter the root directory (/) of the phone, which is where the folder is located

For this you may need to run the ' root’, in this way all user permissions will be granted to the owner of the phone. Also, a file manager that has the ability to explore the root files of the device in question should be obtained.

From there, and being in the location mentioned, the Android "EFS" folder is placed (/efs) and the finger is pressed on it. This will show a series of options, what you will need to do is select the one that says " Copy"  to clone the contents of the files.


Next, it needs to be pasted to a separate location, other than the root folder. It can work if done in removable memory or SD.

Restores the EFS folder

If, on the other hand, you want to restore the EFS folder using a backup, you will only have to reverse the procedure.

That is, copy the security duplicate and, through a file manager with root permissions, place the EFS folder in the path ' /efs’


After that, your computer will restart in recovery mode or ' Recovery mode ', where it will be sufficient to follow the following instructions or commands.

Choose the options in this order ' Wipe factory reset ', then in ' Wipe cache partition ' and finally ' Advanced / clear dalvik cache '.

Once this is done, the terminal will restart and the EFS folder of the Android device in question will have been restored.

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