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README.md: Document Repair Mode #243

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Dec 30, 2023
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README.md: Document Repair Mode #243

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Expand Up @@ -233,6 +233,24 @@ This is especially important for some custom OS's because their system updater a

To self-host a custom OTA server, see [Custota](https://github.com/chenxiaolong/Custota).

## Repair mode

Some devices now ship with a Repair Mode feature that boots the system with a fresh `userdata` image so that repair technicians are able to run on-device diagnostics without needing the user's credentials to unlock the device.

When the device is rooted, it is unsafe to use Repair Mode. Unless you are using release builds of Magisk/KernelSU signed with your own keys, it's trivial for someone to just install the Magisk/KernelSU app while in repair mode to gain root access with no authentication.

To safely use Repair Mode:

1. Unroot the device by repatching the OTA with the `--rootless` option (instead of `--magisk` or `--prepatched`) and flashing it.

2. Turn on Repair Mode.

3. After receiving the repaired device, exit Repair Mode.

4. Flash the (rooted) patched OTA as normal.

Because the unrooting and rooting are done by flashing OTAs, the device's data will not be wiped.

## avbroot modules

avbroot's Magisk/KernelSU modules can be downloaded from the [releases page](https://github.com/chenxiaolong/avbroot/releases).
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