EFS is the very sensitive system directory that contains Phone-specific information such as the IMEI, wireless devices MAC addresses, product code, baseband version, product code, system ID, NV data 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.
1. 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.
Please check to make sure the backup worked. Any issues please post recovery log only.
Backup your "G3_EFS_Flashable_Restore.zip" somewhere else besides your internal sdcard.
Your SDCard may get erased so be safe. Email it to yourself.. or upload it to the "cloud" etc..
To manually backup EFS use the 4 ADB commands below. They will backup your 2 EFS partitions into /sdcard/
2. 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:
DO NOT FLASH YOUR EFS RESTORE ZIP TO ANOTHER DEVICE!
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