I am not sure how many people will visit this lesson about their knowledge of the existence or importance of EFS that we are about to talk about today! Most of the time I read about those people that ask for solutions to several things such as their inability to make a phone call, send a text message, or even browse the Internet through network service providers. Imagine that your phone is without any network connection at all, and only then will you know the importance of what we are talking about now.
If EFS file is important, then you should preserve it so that you can use your phone for the usual things that include all the communication features of the it. This file is present in all smart devices that have the IMEI number associated with them, but the difference here is often where it is stored. On Samsung devices, IMEI number and all other connection data are stored in a specified folder within the system files and I have already talked about it many times before.
You can backup the EFS folder by running the EFS Pro app and by following the prompts. For more aspects, details and for the features list of the tool, you should take a look here (this is also the. Amazon EFS is natively integrated with AWS Backup. You can use the EFS console, API, and AWS Command Line Interface (AWS CLI) to enable automatic backups for your file system.
In this article, we’ll backup EFS partition of your Android device with the help of an Android App namely “EFS IMEI Backup” developed by Wanam. It is an extremely well developed and powerful app that helps you backup EFS partition with just a few clicks. It completely supports internal and external storage for saving EFS backups. Bofore backing up the EFS folder you need make sure your Andriod device is rooted. Then, install Custom Recovery on your device. Open the Custom Recovery, select the Backup option, and go on select the. This application let you save a backup of your EFS (IMEI) partition (if exists) on any device running Android 3+, this help you to keep your IMEI safe from getting corrupted after any bad Rom flashing issues, this is a common issue with Samsung devices, if somehow you lost your IMEI, you won't be able to get registered and connected to any mobile network.
Have you ever wondered what an EFS file is on a Samsung phone? You are probably curious right now and want to know more about it. EFS is a folder located within the phone system files that contains several important and necessary information such as IMEI number, MAC Address (for Wi-Fi connection), Baseband number, in addition to many other information on the same subject.
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And if you lost EFS file, you will notice that the phone has lost it’s IMEI number in addition to its inability to connect to Wi-Fi networks. Now you may be wondering about the reasons for losing this important information from your phone in the first place?! Well, the answer is simple, and the reason is most likely while you are changing something in your device system. Sometimes when you change kernel, and in most other cases the custom ROMs flashes are often the cause of loss of IMEI information.
In this case, the network loss issue or E: failed to mount/efs error is most likely due to what you are doing after rooting the phone. This is in addition to mentioning that most custom ROMs developers at the present time incorporate a script that creates an automatic backup copy of EFS information on external SD memory so that you can retrieve it again in the event of any of these previous cases. But to be honest, it’s not a good idea to always rely on what other people are doing. So you will notice that we at Mohamedovic always write a complete warning about making a backup copy of current stock ROM before flashing custom ROMs or changing anything in order to avoid such matters.
Unfortunately, most people start inquiring about something called EFS when they are actually faced with the problem of missing it. And once lost, trying to restore it again without a backup copy is almost impossible. You may have heard before or even encountered a problem that the phone is unable to define EFS data or an E: failed to mount /efs invalid argument as you can see in the following image:
In the event that you saw this message on the your phone screen, well, now you are in a real problem and you will not be able to get rid of it with a few specific steps like the usual errors. Of course, there are several ways through which you can recover EFS data, but it is either note suitable for all devices, or it does not work at all. So, as we always advise, there are some important things to do once your device is rooted, including saving the EFS file in a safe place, as well as making a full backup of the current official ROM on your phone.
Before you can backup EFS / IMEI information, whether on the phone or computer, there are some necessary requirements that must be met first:
Once you have saved a “safe” backup of your phone’s EFS information, you can now take a deep breath and feel a bit of reassurance since now you can try anything without worrying about any future mistakes about it. But it is also important that you know how to recover IMEI data in case it is lost, since the phone has a backup copy of it:
Now you will notice that your Samsung Galaxy device has recovered the corrupted EFS / IMEI information back to its normal path inside the system files. To make sure of the success of the process, from the phone calling app, dial *#06# to see current IMEI number.
On the other hand, there is a high chance that you have lost your EFS information and that your phone is truly without a network. Well, the solution here is to try downloading stock ROM (4 files) for your device, and then head over to the tutorial on how to flash the official ROM using Odin.