BackupsResearch¶

• Table of contents
• BackupsResearch
  • Doing the backup of partitions or other block devices
    • adb shell cat pipe
    • adb shell cat adb pull
    • adb pull the block device

Doing the backup of partitions or other block devices¶

adb shell cat pipe¶

Old versions of the EFS backup instructions used the following command:

adb shell "cat /dev/block/platform/*/by-name/EFS > /EFS.img" 

At some point or under some condition, this stopped working and the backup were corrupted.

adb shell cat adb pull¶

adb shell "cat /dev/block/platform/*/by-name/EFS /dev/block/platform/*/by-name/EFS" > /EFS.img" EFS.img
adb pull /EFS.img ./

Doing in in two stage like that seem to be widely used in other instructions (like the ones found in XDA forums).

Normally cat should produce a valid backup, however it might be better to use dd for extra safety.

• Galaxy Nexus
• Galaxy SIII

adb pull the block device¶

The following should also work:

adb pull /dev/block/mmcblk0p3 ./EFS.img