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
- Connect galaxy nexus to PC/Laptop
- type command
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.