EFS folder is very sensitive system folder. It contains various phone specific information such as IMEI, wireless devices MAC addresses, product code, and much more.This thing can turn your device complety useless if it is handled properly. Because it will no longer be recognized by your carrier.Sometime a flashing customs ROMs can corrupt contains within EFS folder and it is an problem.So for that backing up EFS folder is important if you want to flash new ROM.Developer can develop a tool that can backup and restore ‘EFS’ folder easily in your device and it is called EFS pro.No need to say, this tool require a rooted device. Features of the tool • It supports Backup and Restore of Partition Image (*.img) and Compressed TAR Archive (*.tar) formats. • It detects the EFS backups which is saved on device and PC for hassle free restoring automatically. • Re-Scan option to refresh Backup list for restoring Backups. • It re-mounts “EFS’ folder and also permits to read and write during restore for users ‘stuck’ with read only permissions.

• It dedects and promp of mass storage mode automatically. • It automatic deduct and terminates of Samsung kies application on start up.it also supports multiple backup handling. • Option to Format ‘EFS’ partition before restoring an EFS Backup.

• Displays various Device, ROM and BusyBox related information on startup. • It displays various devices like rom and busy box and other related information on startup. • It attempt and restore nv data from ‘*.bak’ files if they exist to fix corrupt or incorrect IMEI number. • It also repairs NV dava file ownership to fix unknown basement and no network signal • It automatically detect ‘efs/’ partition location to add support for many more including future devices. • Hashing of Partition Image Backups to verify the data written.

• Connent your Samsung device with your windows computer to use this tool, and also make sure that your device is not in mass storage mode or backup otherwise, restore functions will fail.

How do I download a ROM from a Samsung Galaxy S3? Be aware that you must not flash PIT and EFS, but you might dump it to have a backup. System.img.ext4 + this.

I have • S3 i9300 • CWM working w/ cannot mount errors • Download mode is fine • It is stuck on Samsung i9300 logo What I have tried • Odin3 all version w/ pit file: fail • Heimdall running on Ubuntu 64: fail Heimdal reports fabio@fabio-VirtualBox:/$ sudo heimdall print-pit --verbose --no-reboot Heimdall v1.4.1 Copyright (c) 2010-2014 Benjamin Dobell, Glass Echidna This software is provided free of charge. Copying and redistribution is encouraged. If you appreciate this software and you would like to support future development please consider donating: Initialising connection.

Detecting device. Manufacturer: 'SAMSUNG' Product: 'Gadget Serial' length: 18 device class: 2 S/N: 0 VID:PID: 04E8:685D bcdDevice: 021B iMan:iProd:iSer: 1:2:0 nb confs: 1 interface[0].altsetting[0]: num endpoints = 1 Class.SubClass.Protocol: 02.02.01 endpoint[0].address: 83 max packet size: 0010 polling interval: 09 interface[1].altsetting[0]: num endpoints = 2 Class.SubClass.Protocol: 0A.00.00 endpoint[0].address: 81 max packet size: 0200 polling interval: 00 endpoint[1].address: 02 max packet size: 0200 polling interval: 00 Claiming interface. Marshall lead 12 combo review.