Wednesday, November 11, 2015
How to Backup & Restore EFS [IMEI] for All Samsung Galaxy S4 Variant
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Without IMEI, you cannot make calls, send SMS or use mobile data.
EFS is a partition on the internal memory of your device which contain important data including the IMEI.
If the data in this partition gets corrupt, you will lose your IMEI
Requirements :
1. Samsung galaxy S4 device
2. "Android Terminal Emulator" app (Link below)
Before starting :
1. Root your device
2. Download and install "Android Terminal Emulator" app
1. Open "Android Terminal Emulator" and type
Su
Then enterIt will ask for root permission
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2.A. For galaxy S4 GT-I9500 Type :
dd if=/dev/block/mmcblk0p3 of=/sdcard/efs.img
Then enterB. For galaxy S4 all LTE and US variant Type :
dd if=/dev/block/mmcblk0p10 of=/sdcard/efs.img
dd if=/dev/block/mmcblk0p11 of=/sdcard/mod1.bin
dd if=/dev/block/mmcblk0p12 of=/sdcard/mod2.bin
Then enter dd if=/dev/block/mmcblk0p11 of=/sdcard/mod1.bin
dd if=/dev/block/mmcblk0p12 of=/sdcard/mod2.bin
C. For galaxy S3 all LTE and US variant Type :
dd if=/dev/block/mmcblk0p11 of=/sdcard/efs.img
dd if=/dev/block/mmcblk0p12 of=/sdcard/mod1.bin
dd if=/dev/block/mmcblk0p13 of=/sdcard/mod2.bin
Then enter
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EFS Restoring Steps :
1. Send the files (Step 3) to the internal storage of your device
2. Open "Android Terminal Emulator" and type :
Su
Then enterIt will ask for root permission
3.A. For galaxy S4 GT-I9500 Type :
dd if=/sdcard/efs.img of=/dev/block/mmcblk0p3
Then enter 
dd if=/sdcard/efs.img of=/dev/block/mmcblk0p10
dd if=/sdcard/mod1.bin of=/dev/block/mmcblk0p11
dd if=/sdcard/mod2.bin of=/dev/block/mmcblk0p12
Then enterdd if=/sdcard/mod1.bin of=/dev/block/mmcblk0p11
dd if=/sdcard/mod2.bin of=/dev/block/mmcblk0p12
C. For galaxy S3 all LTE and US variant Type :
dd if=/sdcard/efs.img of=/dev/block/mmcblk0p11
dd if=/sdcard/mod1.bin of=/dev/block/mmcblk0p12
dd if=/sdcard/mod2.bin of=/dev/block/mmcblk0p13
Then enter4. Restart your device
Done !
YT Video link : http://www.youtube.com/watch?v=tJQjZgbmW3Y
Notes :~ It won't delete your data
~ Make sure you choose the correct cmd in restoring process
~ This method will work only on ROOTED devices
~ Backing up EFS partition is highly recommended for users who use the custom Roms
~ Use it at your own risk
~ This method won't repair your device if you don't have a backup of the EFS partition, but you can to try this How to Fix "Not Registered on Network"/Wrong IMEI for Galaxy S3/S4/Note2
~ Every device has unique partition, so you can't use this if you have backup file from another device
Downloads :
Android Terminal Emulator App HERE
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