Make sure your Boost is powered on and your Mevo is properly mounted on it. When a firmware update for the Mevo Boost is available, the app will prompt you to update after you connect to your camera. Tap Update to proceed.
The update should only take a few seconds. The app will indicate when the update is complete and you can continue using your camera.
If you experience intermittent Ethernet connectivity issues after the update, simply power off the Mevo camera, then power it back on. This should resolve the issue.