egzthunder1 · Oct 25, 2011 at 10:02 am

Backup And Restore Your EFS Folder On Samsung Devices

The wonderful world of NV, EFS, and all the inherent dangers that come from messing with this. For those of you who have no clue as to what I am talking about, there is a dark, really deep and well protected section of your device that is virtually immune to any kind of flashing and manipulation (unless of course you know how to access it). This part of the device contains information such as IMEI (or MEID and ESN in the case of CDMA devices), programming parameters for the device such as your account information (phone number, etc), data provisioning parameters, and a whole bunch of other things that, when not handled properly, can render a device completely useless. All of these are contained in the infamous \EFS folder. XDA Recognized Developer lyriquidperfection just updated an app that he started working on not too long ago, which basically allows you to back up and restore the contents of this folder, just in case. It seems to be rather simple to corrupt this by trying to unlock or change certain “numbers” in it, which is why being able to back up the original thing is rather important. HTC devices are normally associated with tweaking this due to the ease of getting the device in Diag mode via EPST. However, Samsung devices (and really most devices out there) can indeed be put in Diag mode to access this special section.

Before you go digging around for ways to mess with your EFS folder, you need to understand that, unlike flashing a device (which could potentially lead to bricks as well) could render your device completely useless as it will no longer be recognized by your carrier. From this point, there is no  tool to allow you to recover from a mistake done in here, so proceed with extreme caution. Have fun and happy (and safe) hacking!


This is a very sensitive system folder that contains Phone-specific information such as the IMEI (encrypted in the nv_data.bin), wireless devices MAC addresses, product code (also in the nv_data.bin), and much more. Often users trying to change product codes or trying to unlock the mobile will end up corrupting data in this location.

You can find more information in the original thread.

Want something published in the Portal? Contact any News Writer.

Thanks lyriquidperfection for the tip!


_________
Want something on the XDA Portal? Send us a tip!

egzthunder1

egzthunder1 is an editor on XDA-Developers, the largest community for Android users. I have been an active member of xda-developers since 2005 and have gone through various roles in my time here. I am Former Portal Administrator, and currently part of the administrator team while maintaining my writer status for the portal. In real life, I am a Chemical Engineer turned Realtor in the Miami area. View egzthunder1's posts and articles here.
Jimmy McGee · Jul 31, 2015 at 06:00 am · 1 comment

OnePlus 2 Teardown, Major Android Vulnerability – XDA TV

The OnePlus 2 has been officially released. That and much more news is covered by Jordan when he reviews all the important stories from this week. Included in this week's news is the announcement of a serious security vulnerability on Android and be sure to check out the article talking about how easy it is to make your one Xposed Module. That's not all that's covered in today's video! Jordan talks about the other videos released this week on XDA...

XDA NEWS
Mario Tomás Serrafero · Jul 30, 2015 at 02:04 pm · 3 comments

What Do You Think About Fingerprint Scanners?

More and more phones are featuring fingerprint scanners, and with many promising developments and it being natively supported on Android M, we can soon expect to see them on smartphones everywhere. If done right, it is a useful feature that allows for quick unlocking and authorization. There are concerns regarding security, but nonetheless the industry seems to be embracing it with open arms. What do you think?

DISCUSS
Aamir Siddiqui · Jul 30, 2015 at 01:20 pm · no comments

What’s Next for Samsung and Its Flagships?

If we were to say that the Galaxy S6 was a leap of faith made by Samsung, we wouldn't be too wrong. After all, the device marked a definite change in how Samsung perceived the market and its own place in it, as it stood amongst the signs of decline which started with the critical reception of the Galaxy S5. To recap, the Samsung Galaxy S5 was criticized heavily for feeling more like a toy, rather than a premium flagship...

XDA NEWS