The AVIO USB-C is able to use power from a USB-C port to power itself and transmit and receive Dante audio flows. However, during an upgrade, power from a USB-C port cannot be used because the USB-C power delivery chip on the AVIO will be reset. Therefore, it is absolutely necessary to use a PoE switch or a PoE injector during the upgrade. After the upgrade is fully complete the AVIO USB-C can be safely disconnected from PoE. If Dante Updater is telling you to contact the manufacturer for an AVIO device, see Dante Updater fails to update Dante AVIO adapter – asks user to contact manufacturer
If you use PoE switch or PoE injector and still have problem with the firmware upgrade, see I cannot update the firmware using Dante Updater