The VidiU App will display a warning message if your VidiU or VidiU Mini is missing the secondary Recovery Firmware when you try an update of the main firmware:
"Your device recovery image has not been installed."
At this time, Recovery Firmware must be manually updated through the Web UI of the unit.
1. download the most recent Recovery Firmware image (version 3 or later) to a computer on the same network as the VidiU or VidiU Mini. Recovery Firmware is available from the following link:
NOTE: do not double click or try to open the Recovery Firmware file, it will be uploaded as-is to the device.
2. access the firmware upgrade page of your VidiU or VidiU Mini unit.
These knowledge base articles show how to access and upload firmware to the VidiU:
This tutorial video shows how to access and upload firmware to the VidiU Mini:
3. make sure the Vidiu or VidiU Mini is plugged in to external DC power; VidiU Mini must have a 1 Amp minimum USB power source
4. at the firmware upgrade screen, select the Recovery Firmware image you downloaded (not a regular firmware image) and upload it to the device