[Samsung Galaxy Core.] StratOS_HTC:
This topic has allready been answered here, but since lot of users need this this is a brief :

Here it is:

It's a modified version of win bash shell.

It uses adb for doing things.

Must have rooted device

adb shell must be granted su access !

Backup_EFS.bat creates a backup and post some usefull infos about current EFS.

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Backup EFS by StratOS - press any key to start
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Press any key to continue . . .
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Starting Galaxy Core 2 EFS backup
Needed rooted device !
Grant adb shell root access
Plugin phone with USB Cable
USB debuging must be enabled !
Backup made in internal SDCard too - Main Storage
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* daemon not running. starting it now on port 5037 *
* daemon started successfully *
Found :
samsung
SM-G355HN
StratOS rom v1.1
Checking superuser access (#root ; 0:0 context=u:r:init:s0)
Current ID :
uid=0(root) gid=0(root) context=u:r:init:s0
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EFS INFOS :
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drwxrwxr-x system system u:object_r:unlabeled:s0 FactoryApp
-rw-r--r-- system system u:object_r:efs_file:s0 applied_sdcard_poli
cies
drwxrwxr-x radio system u:object_r:unlabeled:s0 bluetooth
drwxrwxr-- drm system u:object_r:efs_file:s0 drm
drwxrwxr-x radio system u:object_r:unlabeled:s0 imei
drwx------ root root u:object_r:efs_file:s0 lost+found
drwxrwxr-x radio system u:object_r:unlabeled:s0 wifi
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IMEI :
notvisiblenowhe!
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Bluetooth MAC:
20:6E:9C:95:FE:03!
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WIFI MAC:
20:6E:9C:95:FE:04!
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HARDWARE VERSION:
MP 0.401 !
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MPS CODE:
SIO!
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... Backup efs image to /sdcard ...
5120+0 records in
5120+0 records out
20971520 bytes transferred in 0.697 secs (30088263 bytes/sec)
... Pulling efs image from /sdcard ...
2676 KB/s (20971520 bytes in 7.651s)
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EFS Backup created :C:\1\EFS\mmcblk0p14
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* Please write down those infos, they are vital for restore *
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Press any key to continue . . .

Restore_EFS.bat restores the backup ( file mmcblk0p14 !)

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x : Exit
r : Restore
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Choice :r
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EFS backup file exists
... Pushing it to /sdcard
2969 KB/s (20971520 bytes in 6.896s)
... Writting EFS block
5120+0 records in
5120+0 records out
20971520 bytes transferred in 1.395 secs (15033347 bytes/sec)
... Rebooting ...
... Backup Restored !
Press any key to continue . . .

While making backup it creates also backup on Main Storage ( mmcblk0p14 ).

While making restore it also makes a backup in Main Storage ( mmcblk0p14.efs).

If u use a EFS backup/restore to be made in recovery I could also make that too if u want.

Download :

http://xdaforums.com/attachment.php?attachmentid=3252462&d=1428523634

How to: Extract zip to Windows machine, run mentioned batched files.