Backup Samsung Google Galaxy nexus EFS

Backup EFS before install a custom room or etc. it`s something that we must do!
EFS contains IMEI and another device details.
Make sure that Galaxy nexus is already root before do this.

How to backup Galaxy Nexus EFS

  1. Connect galaxy nexus to PC/Laptop
  2. type command

    adb shell
    dd if=/dev/block/platform/omap/omap_hsmmc.0/by-name/efs of=/sdcard/efs.img

efs.img will be save in SDcard, you can use it for restore backup.

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