This is fundamentally to avoid uncorrectable errors in the event that some of these processes fail, thus providing insurance. Especially if the person who is going to perform the procedure is doing it for the first time, which makes it more likely that something could happen.
So it is always advisable to make a backup of this essential file, which will guarantee the safety of the computer.
What is the Android ‘EFS’ folder and what is it for?
This folder has an essential function within the cell phone, since it has stored certain data of vital importance for the computer.
These are comprised of SIM data, as well as IMEI number, Bluetooth information and MAC number, as well as other essential information.
In addition, it saves the ‘ PRODUCTCODE’ or, better said, the product code, and in the same way the SIM UNLOCK is found.
All these files contained in the folder are essential elements that, when deleted by accident, can cause irreparable damage.
And this why? Well, this is the main objective when trying to free a cell phone or change the version of Android or install a ROM.
That is where the importance of generating a backup of the folder lies, in this way it is ensured that said irrecoverable and unique data will be safe.
And if a problem occurs during the process and the Android ‘EFS’ folder is damaged, the computer can be reset without problems.
If it did not have it, there would be no way to repair the cell phone, causing an irreversible state in it, preventing it from performing 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.
That said, it represents a risk if it is not done properly, so if you do not have the skill for the task, it is best not to do it.
Thus, you can also find someone you trust and who also has experience to help the owner of the equipment to perform the backup.
Now, if you decide to start, what you must do to proceed is enter the root directory ( / ) of the phone, which is where the folder is located
For this you may have to ‘ root’, in this way all user permissions will be granted to the owner of the phone. Also, a file manager should be obtained that has the ability to explore the root files of the device in question.
From there, and being in the mentioned location, the folder ‘EFS’ of Android ( / efs ) is placed, and the finger is pressed on it. This will show a series of options, what you will have to do is select the one that says ‘ Copy’ to clone the content of the files.
Next, it has to be pasted in a separate location, other than the root folder. It can work if done in removable memory or SD.
Restore the EFS folder
If, on the other hand, you want to restore the EFS folder using a backup, you will only have to do the process in reverse.
That is, copy the security duplicate and, through a file manager with root permissions, place the EFS folder in the path ‘ / efs’
Next, the computer will restart in recovery mode or ‘ Recovery Mode’, where it will be enough to follow the following instructions or commands.
Choose in this order the options ‘ Wipe data factory reset’, then in ‘ Wipe cache partition’, and finally ‘ Advanced / wipe dalvik cache’.
Having done this, the terminal will restart and the EFS folder of the Android device in question will have been restored.