My Homey has been working fine. a week ago it lost all zigbee modules, I restored my homey and it worked.
In that case it no longer works and I get the message “Zigbee could not be started.”
I have tried everything, restore, update, different power supply, nothing works.
Don’t forget to try another usb cable as well!
Else:
Start in recovery, and perform the so called “full software download”.
This solved the zigbee issue for several users.