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Try to reboot the device by holding the power button for ~20 seconds.
If you get working diags menu after the reboot, follow these instructions:
1. Tap on "S) Device settings"
2. Tap on "X) Exit"
3. Tap on "D) Exit, Reboot or Disable diags"
4. Tap on "D) Disable diagnostics"
5. Tap on "Q) To continue"
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