Unable to open the virtual host developer option.

1. First, open the main page of the mobile phone and click the "Settings" option.

2. Secondly, after entering the settings, slide to the bottom of the page and click the "About Mobile Phone" option.

3. Finally, enter the interface, click the "version number" option or "Android version" for more than seven times to open the virtual main developer option.

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Alarm processing,