You're trying to update your firmware but the app says "You need to turn off Lumina's microphone" like the screenshot below:
1. Please check that no other apps are using Lumina's microphone (Zoom, Teams, Meets, in-browser apps, etc.)
2. Go to your System Preferences -> Sound -> Input.
3. Select Macbook Air Microphone - Built-in instead of Lumina Camera - Raw.
"You need to turn off Lumina's microphone" should disappear in the app. If not, try switching input from Lumina Camera - Raw to Macbook Air Microphone - Built-in again.
4. Update your firmware in the app!