Android A to Z: What is the EFS folder? - AndroidAyuda - Android Help

Any Android user should know that your OS is full of possibilities, something that much different from iOS, but you should also know that the possibilities also come complications. Do you know what is the EFS folder ? A track has a lot to do with the release of smartphones, as well as with the IMEI of the terminals.

Here in Spain we DNI: National Identity. This data consists of the principal of any person as well as an associated number that identifies each person. Well, in all Android smartphone and in all mobile phone we have an IMEI, a unique number that identifies the phone and is not transferable. It is a crime in fact change, and even in some cases can serve as a key to access certain services. WhatsApp, for example, identifies the user through the Android correct IMEI. However, this number can be changed by mistake, and along with this, in the same folder, we find that if are deleted files can end our smartphone permanently.

Does it sound

that of sudden death? Sure you sound. Well, the problem was essentially deleting this folder. If by mistake we who can delete this folder and go goodbye mobile phone, and the only thing that could save him would be the company’s service.

What’s in the EFS folder?

EFS folder

we find several files:

class=”c3″> nv_data.bak: This is the most important of all file contains IMEI code information, the ProductCode, or code and the SIM UNLOCK. Modifying this file can be used to unlock the smartphone. Android smartphones that come with factory Barring can be modified for changing the SIM UNLOCK parameter, and can use SIM cards from other operators. Now this process is anything but safe, so you need to take extreme care when working with the modification of these files and well documented in case some users have had problems like sudden death. Recall that manufacturers are not so foolish to let anyone to edit these files in a simple way.

nv_data.bak.md5: This file is the checksum above, and is also very important, as it serves to check the values ??of the above file. Without this, the above also applies.

nv_ta_bin da: It is neither more nor less than a copy of the main file, the nv_data.bak. No need to explain what this file, since it is equal.

nv_data.bin.md5: This file is the checksum before. No matter, in principle, if you delete this, since a new one is created equal when starting the smartphone.

nv_sate t: is the file that not known function. We do not know for what, but if you delete, you create automatically again.

nv2.bak: This file is only on Android smartphones with operating system version 2.2 Froyo. They manage all data of the above files in the previous version to Gingerbread.

nv2.bak.md5: Guess. Solo is the previous file checksum, and as such, is only found in smartphone with Android 2.2 Froyo version.

Modifying these files?

Now, not so easy to modify these files. Obviously, any user with advanced skills should not make changes, and for this, they become files only accessible by Super User Root permissions. Even so, there are many users who already have such permits, and could delete this folder without even knowing what they are doing. Therefore, it’s best to explain how to erase and change, so that they act with knowledge. To modify these files requires a browser with root permissions, such as Root Explorer, or Root File Manager. Either of these valid. You also need superuser permissions. Once we have started the file browser application, we go to the root folder of the mobile phone, not the SD card, and there look EFS folder. Quickly locate, and can open. One thing that we should do for security is a backup of it. To do this, just hold down on the folder, select Copy, then paste it into the SD card. Then keep the folder on your computer, and in certain places, to avoid losses. In the future, sudden death, loss of IMEI, or experience problems could be solved thanks to this backup.