Moving from stack version 5.4 to 6.6 or 6.7.8 improves connectivity with modern devices and is often required for stable use with Zigbee2MQTT .
After both radios are flashed:
: Always perform an NVM backup of your Z-Wave and Zigbee networks before attempting an update to avoid losing paired devices. 1. Zigbee Firmware Update (Software Method) nortek husbzb-1 firmware update