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Most manufacturers require a factory reset before sending away to be repaired. However if it's not a software fault then you are inconvenienced.

Is it possible to do a full image backup of the phone? I've read through a few of the answers here but they're a few years old.

Darryn Brisdaz
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  • depends on phone – alecxs Jun 23 '22 at 02:41
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    If an app uses the hardware based AndroidKeyStore then it is not possible. As far as I know cryptographic keys in that store can only be accessed/used but not exported even with root permissions (if the key has been created as non-exportable key). If you perform a factory reset the necessary keys to decrypt those keys are gone. – Robert Jun 23 '22 at 07:15
  • D2D transfer apps are used to backup nowadays. I am not quite sure but this solution might use the same underlying technique https://www.xda-developers.com/lineageos-seedvault-open-source-backup-solution – alecxs Jun 25 '22 at 07:00

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So let's create a new fresh answer then. As mentioned in another answers [1] [2] one can do a full backup of

  • boot
  • system
  • data (there is a trick to include the Internal Storage)

by booting into TWRP and doing so called NANDroid backup (IDK, it's just a big "Backup" button on the main screen)

Once you find a TWRP image for your device, the process looks like this.

adb reboot bootloader

when device at the booloader screen


fastboot flash recovery twrp.img


be ready to press a key combo


fastboot reboot

Before the tablet/phone boots up hold Volume Down + Power buttons. This way we end up in the same bootloader, select Recovery Mode and it will load TWRP.

For more details read here

enter image description here

Mikolasan
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