Software developers must explicitly enable USB debugging on the M400 and M4000.

For most use cases, you can simply navigate to Settings > Connected devices and enable the setting labeled 'Allow ADB'.

To enable ADB along with all developer options, follow the instructions below:

  1. Navigate to Settings > About Glasses > Build number

  2. Tap (using the select button or touchpad) the Build number list entry 7 times (a pop-up will indicate how many remaining taps are needed)

  3. A new menu item is now available. Navigate to Settings > System > Developer options.

  4. Scroll down until you see the USB debugging switch and toggle the switch to enable USB.

You may disable USB debugging and developer mode from the Developer options menu at any time in the future.

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