None of the suggestions above helped. I am running HA OS bare bones on a Lenovo ThinkCentre. Previously I was running HA on the same box under ProxMox but thought it was giving me problems. The hardware (and Proxmox) saw and enabled the Sonoff Zigbee dongle just fine. With HAOS alone, not so lucky. Has anyone really solved the problem? If so please reply, otherwise it’s back to Proxmox. Thanks.
Have you tried using a USB extension cable or better yet a USB hub?
Again, ITead’s Sonoff Zigbee dongle(s) have a very short USB plug and have been known to be too short for some computer chassis which have partially recessed/sunken USB ports, meaning that the short USB plug of ITead’s Sonoff Zigbee dongle will not actually make a physical connection with all of the pins that it needs for USB communication.
You can also check the computer BIOS/UEFI if the USB ports are enabled and if they see any devices.
If it does not work then check if can upgrade the firmware via a other computer just to test if the dongle hardware is seen by an other computer or if it that specific dongle hardware that you have is broken.
If using a other computer then you might need to first install right drivers and reboot before plug it in.