BackupTheEFS » History » Version 11
Denis 'GNUtoo' Carikli, 07/27/2019 10:59 AM
Add the Galaxy Tab 2 7.0 (P3100)
1 | 1 | Denis 'GNUtoo' Carikli | h1. How to backup the EFS |
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2 | |||
3 | h1. Introduction |
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4 | |||
5 | Many devices supported by Replicant have a partition with the modem data (IMEI, etc) which is called EFS. |
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6 | |||
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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8 | |||
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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19 | |||
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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21 | |||
22 | h2. Instructions |
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23 | |||
24 | 10 | Mark Matney | We will backup the modem partition from the [[RecoveryImage|Replicant recovery]]. |
25 | 2 | Denis 'GNUtoo' Carikli | |
26 | This is to make sure that the modem data partition is not being modified when we are doing the backup. |
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27 | |||
28 | h3. Enable root access through adb in Replicant |
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29 | |||
30 | 1 | Denis 'GNUtoo' Carikli | 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. |
31 | |||
32 | 2 | Denis 'GNUtoo' Carikli | This will enable you to also be able to get a root shell in the recovery. |
33 | 1 | Denis 'GNUtoo' Carikli | |
34 | 2 | Denis 'GNUtoo' Carikli | h3. Reboot in the recovery |
35 | |||
36 | Once this is done you need to reboot in the Replicant recovery. |
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37 | |||
38 | This is to make sure that the modem data partition is not being modified when we are doing the backup. |
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39 | |||
40 | To do that: |
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41 | 1. Make sure that your device is booted under Replicant. |
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42 | 2. Press the power button until a menu appears |
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43 | 3. Press "Reboot" |
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44 | 4. Select "Recovery" and then press "ok" |
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45 | 5. The device will then reboot to the Replicant recovery |
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46 | |||
47 | h3. Enable root access through adb in the recovery |
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48 | |||
49 | 3 | Denis 'GNUtoo' Carikli | In order to get a root shell in the recovery you need to do the following: |
50 | 2 | Denis 'GNUtoo' Carikli | 1. Select Advanced |
51 | 1 | Denis 'GNUtoo' Carikli | 2. Select "Mount /system" |
52 | 3 | Denis 'GNUtoo' Carikli | 3. Press the back key to get back to the general menu |
53 | 1 | Denis 'GNUtoo' Carikli | |
54 | 3 | Denis 'GNUtoo' Carikli | Note that on certain devices, "the system partition is already mounted":https://redmine.replicant.us/issues/1934 so you might already be able to get a root shell without mounting the system partition again. |
55 | |||
56 | In any case it's still best to follow the instructions above to make sure that the system partition is mounted on your device. |
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57 | |||
58 | 2 | Denis 'GNUtoo' Carikli | h3. Backup the modem data partition on your computer |
59 | |||
60 | 9 | Denis 'GNUtoo' Carikli | For the Galaxy S 2 (I9100), the Galaxy SIII (I9300), the Galaxy SIII 4G (I9305), or the Galaxy Note 2 (N7100), run the following commands to do that: |
61 | 1 | Denis 'GNUtoo' Carikli | <pre> |
62 | mkdir backup_efs |
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63 | cd backup_efs |
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64 | 4 | Denis 'GNUtoo' Carikli | adb shell "mkdir /efs" |
65 | adb shell "mount /dev/block/platform/*/by-name/EFS /efs" |
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66 | 1 | Denis 'GNUtoo' Carikli | adb pull /efs/ efs |
67 | 4 | Denis 'GNUtoo' Carikli | adb shell "umount /efs" |
68 | 1 | Denis 'GNUtoo' Carikli | adb shell "cat /dev/block/platform/*/by-name/EFS" > EFS.img |
69 | </pre> |
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70 | |||
71 | For the Galaxy Nexus (I9250), run the following commands to do that: |
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72 | <pre> |
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73 | mkdir backup_efs |
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74 | cd backup_efs |
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75 | 5 | Denis 'GNUtoo' Carikli | adb shell "mkdir /efs" |
76 | adb shell "mount /dev/block/platform/*/*/by-name/efs /efs" |
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77 | adb pull /efs/ efs |
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78 | adb shell "umount /efs" |
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79 | 1 | Denis 'GNUtoo' Carikli | adb shell "cat /dev/block/platform/*/*/by-name/efs" > efs.img |
80 | </pre> |
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81 | |||
82 | 11 | Denis 'GNUtoo' Carikli | For the Galaxy Tab 2 7.0 (P3100), run the following commands to do that: |
83 | <pre> |
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84 | mkdir backup_efs |
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85 | cd backup_efs |
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86 | adb shell "mkdir /efs" |
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87 | adb shell "mount /dev/block/platform/*/*/by-name/EFS /efs" |
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88 | adb pull /efs/ efs |
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89 | adb shell "umount /efs" |
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90 | adb shell "cat /dev/block/platform/*/*/by-name/EFS" > efs.img |
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91 | </pre> |
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92 | |||
93 | 1 | Denis 'GNUtoo' Carikli | This will create a copy of the contents of /efs in the backup_efs directory. It will also backup the full partition. |
94 | Keep these files around as a backup in case anything goes wrong. |
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95 | 3 | Denis 'GNUtoo' Carikli | |
96 | 8 | Denis 'GNUtoo' Carikli | If your device has an EFS and is not mentioned in the instructions above, please contact us through the "mailing list":https://lists.osuosl.org/mailman/listinfo/replicant so we could add instructions for your device. |
97 | |||
98 | 3 | Denis 'GNUtoo' Carikli | h3. Reboot in Replicant |
99 | |||
100 | Once the backup is done, you can then reboot in Replicant. To do that: |
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101 | 1. Select "Reboot system now" |
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102 | 2. Your device will then reboot in Replicant. |