[IMPORTANT] How To Do EFS Backup And Restore For GT-I8552 - Samsung Galaxy Grand Quattro

[IMPORTANT] HOW TO DO EFS BACKUP AND RESTORE FOR GT-I8552​
I Got PM Very Long Ago For Way To Backup Of "EFS" But In Last Two Weeks I Started Getting Request Again So Here Is The Simple Way I Wanna Share "How To Backup "EFS" For GT-I8552
As There Is No CWM For Our Device That Supports "EFS" Backup And Also Third Party Apps Ain't Working Now What To Do
So Here We Go Then :-
Q :- What is "EFS" ?
A :- "EFS" Folder Is The Very Sensitive System Folder That Contains Phone-Specific Information Such As The IMEI, Wireless Devices MAC Addresses, Product Code, And Much More. If This Thing Not Handled Properly, Can Turn Your Device Completely Useless As It Will No Longer Be Recognized By Your Carrier.
Problem Is, Flashing Custom ROMs Sometime Can Corrupt Contains Within "EFS" Folder. That’s Why Backing Up "EFS" Folder Is Very Important If You Love To Flash New ROM.
NOTE :- ROOT IS REQUIRED..!!
INSTRUCTIONS :-
EFS BACKUP
1. Download Android Terminal Emulator Or Download ROM Toolbox Pro Or ROM Toolbox Lite.
2. Open Terminal Emulator Or Terminal Emulator In ROM Toolbox App.
3. Use This Code To Backup "EFS"
Code:
su
dd if=/dev/block/mmcblk0p16 of=/sdcard/efs.img
And hit Enter In Keyboard..
4. You Will Get efs.img In Your SDCard, Copy It To PC Or Upload On Storage Sites Like 4shared.com , Mediafire.com etc
EFS RESTORE
1. Download Android Terminal Emulator Or Download ROM Toolbox Pro Or ROM Toolbox Lite.
2. Open Terminal Emulator Or Terminal Emulator In ROM Toolbox App.
3. Use This Code To Restore "EFS"
Code:
su
dd if=/sdcard/efs.img of=/dev/block/mmcblk0p16
And hit Enter In Keyboard..
4. Guess What You Restored Your "EFS"
Please Hit "THANKS" or "DONATE" To Support.

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bro did u try restoring ? r u sure it restore successfully?

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tonyjs007 said:
bro did u try restoring ? r u sure it restore successfully?
Click to expand...
Click to collapse
Yes buddy it will restore u need root access for that thats all :good:

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I already flashed jasp hd Rom before backing up efs partition now what should I do

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ZANKRUT.DOSHI said:
I already flashed jasp hd Rom before backing up efs partition now what should I do
Click to expand...
Click to collapse
Np u can backup now efs.img just in case

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We have to put backup of efs (.img file in internal storage or external while restoring it?? :|
Sent from my GT-I8552 using XDA Premium 4 mobile app

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Jaspreet_Singh said:
Yes buddy it will restore u need root access for that thats all :good:
Click to expand...
Click to collapse
Bro did u restore it by this way? And can u tell me which information stored on mmcblk0p3 ?
Sent from my GT-I8552 using Tapatalk

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kinchit1495 said:
We have to put backup of efs (.img file in internal storage or external while restoring it?? :|
Sent from my GT-I8552 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
internal as above command is for internal only
coolkoushik07 said:
Bro did u restore it by this way? And can u tell me which information stored on mmcblk0p3 ?
Sent from my GT-I8552 using Tapatalk
Click to expand...
Click to collapse
yes its working and p3 is for modem for our device..

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Jaspreet_Singh said:
internal as above command is for internal only
yes its working and p3 is for modem for our device..
Click to expand...
Click to collapse
Ur given command is wrong. There is no sdcard directory, it would be sdcard0 or extSdCard. By the way can u tell me what is the work of bs command. Somewhere i saw people use bs=4096 while using dd command. Can u please explain it?
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Sent from my GT-I8552 using Tapatalk
---------- Post added at 08:42 PM ---------- Previous post was at 07:53 PM ----------
Edit : my bad. Ur code is working too. I did a mistake by /storage/sdcard/ so it gave error. So ignore that part. But if u can please explain bs parameter.
Sent from my GT-I8552 using Tapatalk

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I think it ws wrong it should be sdcard0
Sent from my GT-I8552 using XDA Premium 4 mobile app

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kinchit1495 said:
I think it ws wrong it should be sdcard0
Sent from my GT-I8552 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
Nope. mine works fine, the output should be efs.img

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I think bs stands for block size. But can anyone explain what it does?
Sent from my GT-I8552 using Tapatalk

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thnxs bro for great in gt-i8552
Gt-i8552 rocksss!!!

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coolkoushik07 said:
Ur given command is wrong. There is no sdcard directory, it would be sdcard0 or extSdCard. By the way can u tell me what is the work of bs command. Somewhere i saw people use bs=4096 while using dd command. Can u please explain it?
Sent from my GT-I8552 using Tapatalk
---------- Post added at 08:42 PM ---------- Previous post was at 07:53 PM ----------
Edit : my bad. Ur code is working too. I did a mistake by /storage/sdcard/ so it gave error. So ignore that part. But if u can please explain bs parameter.
Sent from my GT-I8552 using Tapatalk
Click to expand...
Click to collapse
The /sdcard/ *should* be universal on many samsung devices (at least I know it IS like that on the Galaxy Ace and on the Galaxy Win, i8550L that I own).
Regarding the bs operand of the dd command, in this case you don't need it, as you're acting directly over the EFS partition. In the use of this command the bs operand is used for when you're working with a whole disk.
Technical stuff below:
For example, if you don't have the precise /dev/block/mmcblk0pXXX of a partition (taking in consideration that /dev/block/mmcblk0 is the disk you want to read from), you can use dd in this way:
Code:
dd if=/dev/block/mmcblk0 bs=4096 of=/sdcard/kernel.img
In the example, we're backing up the Kernel part of the phone (note that this is not real information, just an example, so don't blame me if you try to dump that command back in the phone assuming things you don't know xD), as you may (or may not) know, a disk is comprised of many blocks, you can google about that later it's quite late and don't wanna go on too deep so i'll try to be brief; if your disk is 512 mb in size, probably the first 32MB would be for boot, kernel, recovery, modem and NVRAM (not to be confused with modem), these 32 MB might be distributed this way:
1-1024MB Bootloader
1024-6144 Kernel+Recovery
6144-18432 Modem
18432-32768 NVRAM
and so on
Long story short, don't mess with DD

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Backing Up EFS Partition
Dear Jaspreet,
Myself and CoolKoushik07 tested this procedure long before. However this is not working solution. This is due to the natture of the EFS filesystem.
Please go through my Post # 39,40,41,42,43,44.
http://forum.xda-developers.com/showthread.php?t=2541198&page=5
Please correct me if I am wrong.
Regards

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Arinio said:
Dear Jaspreet,
Myself and CoolKoushik07 tested this procedure long before. However this is not working solution. This is due to the natture of the EFS filesystem.
Please go through my Post # 39,40,41,42,43,44.
http://forum.xda-developers.com/showthread.php?t=2541198&page=5
Please correct me if I am wrong.
Regards
Click to expand...
Click to collapse
Check ur command "dd if=/dev/block/mmcblk0p3 of=/storage/extSdCard/efs.img"
and mine "dd if=/dev/block/mmcblk0p16 of=/sdcard/efs.img"
Two mistakes ? first is our mounting point for efs is mmcblk0p16 and there is no storage "of=/storage/extSdCard/efs.img" it shud be either to sdcard directly or of=/extSdCard/efs.img

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Jaspreet_Singh said:
Check ur command "dd if=/dev/block/mmcblk0p3 of=/storage/extSdCard/efs.img"
and mine "dd if=/dev/block/mmcblk0p16 of=/sdcard/efs.img"
Two mistakes ? first is our mounting point for efs is mmcblk0p16 and there is no storage "of=/storage/extSdCard/efs.img" it shud be either to sdcard directly or of=/extSdCard/efs.img
Click to expand...
Click to collapse
Just a lil correction.. /storage/extSdCard/ is not wrong directory..
Sent from my GT-I8552 using Tapatalk

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Backing Up EFS Partition
Dear Jaspreet,
Please check my Post #43.
Regards

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Jaspreet_Singh said:
[IMPORTANT] HOW TO DO EFS BACKUP AND RESTORE FOR GT-I8552​
Click to expand...
Click to collapse
hello @Jaspreet_Singh
Im forget to make a backup by my efs folder I8552 again after formated my PC.
Now its empyt cause i had troubles flashing test by custom rom
Important
Except the stock lockscreen and stock setupwizard inicial everything works even empty folder cause I managed to recreate the mac adress, retrieve the IMEI
3G signal ok
calls Ok
IMEI ok
IP/Wi fi ok
Is it something can u do , like send files folders attachment and i using sdk put my mac adress, ip and imei to restore files?
tks

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@mjraogr....
Add facebook.
https://m.facebook.com/GlaMsP?ref=bookmark
I also had the same problem, I was looking for solutions to this problem and in one of these search found an EFS file from another machine and tried their luck to restore my folder ..
Following the steps in this link posted by @manojkumar8552 my work out and now is working perfectly.
Download these files, extract the desktop.
https://drive.google.com/file/d/0B6t2vRswL0dHVXRKYXZncGd1WVU/view?usp=sharing
1 - run the Backup_EFS ...
2 - Once completed Backup your EFS.img, rename such as EFS MY or something.
3 - Inside the folder contains another file (efs Restore.img) change the name to EFS.img.
4 - Run the Restore_EFS ...
5 - Restart the device ...
6 - Enter the ROOT folder with Explorer, find the EFS / Factoryapp folder, edit the file (factorymode) will contain OFF switch to ON all upper case, reset the unit ....
Good luck ... these steps have worked in the mine, hope it helps ...
NOT TO THANK !!