BackupTheEFS » History » Version 1
Denis 'GNUtoo' Carikli, 05/11/2019 07:36 PM
Move the instructions to backup the EFS in a separate page
1 | 1 | Denis 'GNUtoo' Carikli | h1. How to backup the EFS |
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3 | h1. Introduction |
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5 | Many devices supported by Replicant have a partition with the modem data (IMEI, etc) which is called EFS. |
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7 | It's a good idea to do a backup of this partition, to make it easier to restore it if it becomes corrupted, as "it can sometimes happen with Replicant":https://redmine.replicant.us/issues/1869. |
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9 | Only the following devices that are supported by Replicant have a modem data partition (EFS): |
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10 | * Galaxy S 2 (I9100) |
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11 | * Galaxy S 3 (I9300) |
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12 | * Galaxy S 3 4G (I9305) |
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13 | * Galaxy Nexus (I9250) |
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14 | * Galaxy Note (N7000) |
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15 | * Galaxy Note 2 (N7100) |
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16 | * Galaxy Tab 2 7.0 (P3100) |
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17 | * Galaxy Tab 2 10.1 (P5100) |
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18 | * Galaxy Note 8.0 (N5100) |
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20 | If you have a device that is not mentioned in the list above, it most probably doesn't have a modem data partition, so you don't need to make a backup. |
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22 | h2. Instructions |
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24 | First make sure that you have adb setup correctly and that it gives you a root shell on the device by following the wiki page that explains how to [[ADB|install adb and get a root shell]] on your device. |
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26 | Once this is done you can then backup the EFS. |
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28 | For the Galaxy SIII (I9300), run the following commands to do that: |
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29 | <pre> |
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30 | mkdir backup_efs |
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31 | cd backup_efs |
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32 | adb pull /efs/ efs |
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33 | adb shell "cat /dev/block/platform/*/by-name/EFS" > EFS.img |
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34 | </pre> |
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36 | For the Galaxy Nexus (I9250), run the following commands to do that: |
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37 | <pre> |
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38 | mkdir backup_efs |
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39 | cd backup_efs |
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40 | adb pull /factory/ factory |
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41 | adb shell "cat /dev/block/platform/*/*/by-name/efs" > efs.img |
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42 | </pre> |
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45 | This will create a copy of the contents of /efs in the backup_efs directory. It will also backup the full partition. |
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46 | Keep these files around as a backup in case anything goes wrong. |