LG G3 EFS Backup and Restore

Backing up EFS
Flash LG_G3_Flash2BackupEFS.zip to make a EFS backup.
Flashing LG_G3_Flash2BackupEFS.zip creates G3_EFS_Flashable_Restore.zip in your /sdcard/EFS_Backup/ folder.
G3_EFS_Flashable_Restore.zip contains your backed up EFS partitions. Flash it if EFS restore is ever needed.


To manually backup EFS use the 4 ADB commands below. They will backup your 2 EFS partitions into /sdcard/

adb shell
su
dd if=/dev/block/platform/msm_sdcc.1/by-name/modemst1 of=/sdcard/modemst1.img
dd if=/dev/block/platform/msm_sdcc.1/by-name/modemst2 of=/sdcard/modemst2.img

Restoring EFS
To restore your original EFS just boot into recovery and flash the G3_EFS_Flashable_Restore.zip in your /sdcard/EFS_Backup/ folder.

To manually restore efs img files run the following commands using adb shell while in recovery:

adb shell
su
dd if=/sdcard/modemst1.img of=/dev/block/platform/msm_sdcc.1/by-name/modemst1
dd if=/sdcard/modemst2.img of=/dev/block/platform/msm_sdcc.1/by-name/modemst2