This is straight from AI
"We would like you to try to re-install the firmware on your Vega.
To do this, unplug power to the Vega. Then, while holding down the button on the Vega, plug back in the power. After a few seconds, release the button. This will force the light into 'boot-loader' mode, meaning it doesn't have any firmware on it.
Then go back to the Director and Discover the light again and Save it to the Layout. Double click the light in the layout and click "Update Firmware". Once the firmware is updated, follow the onscreen instructions. You will need to un-Discover and Discover your lights again."