Cannot find Bluetooth on other phones

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After upgrading the system, the battery level only shows 5 bars, not the percentage. Also, when there's only one bar of battery left, the screen dims and the sound gets quieter, and I can't adjust the settings.
Dear Sir/Madam, I am concerned about Israel's recent terrorist attack on civilians in Lebanon using a remote-controlled decoy device. For my safety and that of my loved ones, I would like to confirm that Israel is not involved in the manufacturing or supp
DK10 upgraded to the EU version of the system in July, and now the online upgrade cannot detect the new version.
The upgrade package could not be installed during online upgrade, and the error message "Install fail Reason: 20" appeared.

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Q：Cannot find Bluetooth on other phones

A：1. Ensure the phone/tablet you want to connect is powered on and has sufficient battery power.
2. Ensure the phone/tablet you want to connect is within range (10 meters) and Bluetooth is enabled.
3. Ensure the phone/tablet is not connected to any other Bluetooth devices of the same type.
4. Restart the phone/tablet and try searching again.

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