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I want to know on what conditions a device UUID changes? I heard it changes on factory resets and android upgrades, but I have not found any proof or documented sources.

Thanks,

Biswas Khayargoli
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1 Answers1

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Read here the Documentation

A 64-bit number (as a hex string) that is randomly generated when the user first sets up the device and should remain constant for the lifetime of the user's device. The value may change if a factory reset is performed on the device.

About UUID behaviour on Android update there isn't much documentation online, but you can check This answer

  • In some rare circumstances, this ID may change. In particular, if the device is factory reset a new device ID
    • may be generated. In addition, if a user upgrades their phone from certain buggy implementations of Android 2.2
    • to a newer, non-buggy version of Android, the device ID may change. Or, if a user uninstalls your app on
    • a device that has neither a proper Android ID nor a Device ID, this ID may change on reinstallation.
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