Hi,
I encounter the problem on the subject and have solved it - I’m posting the details here if someone else gets it.
Though similar to the problem presented by @alteredstate Updated Hass.io And Now All Zwave Devices Are Listed As Unavailable, my problem and solution were different.
Details:
RPi 3B+ with SSD and UZB Zwave disk
Hassio 105.3
Upgarding to HassOS 3.10 (I think from 3.6…)
After reboot, all zwave devices are unavailable.
Developer tools -> log:
2020-02-14 08:54:51 ERROR (MainThread) [homeassistant.config_entries] Error setting up entry Z-Wave for zwave
Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/openzwave/option.py", line 78, in __init__
raise ZWaveException(u"Can't find device %s : %s" % (device, traceback.format_exception(*sys.exc_info())))
openzwave.object.ZWaveException: "Zwave Generic Exception : Can't find device /dev/ttyACM0 : ['NoneType: None\\n']"
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/src/homeassistant/homeassistant/config_entries.py", line 215, in async_setup
hass, self
File "/usr/src/homeassistant/homeassistant/components/zwave/__init__.py", line 369, in async_setup_entry
config_path=config.get(CONF_CONFIG_PATH),
File "/usr/local/lib/python3.7/site-packages/openzwave/option.py", line 81, in __init__
raise ZWaveException(u"Error when retrieving device %s : %s" % (device, traceback.format_exception(*sys.exc_info())))
openzwave.object.ZWaveException: 'Zwave Generic Exception : Error when retrieving device /dev/ttyACM0 : [\'Traceback (most recent call last):\\n\', \' File "/usr/local/lib/python3.7/site-packages/openzwave/option.py", line 78, in __init__\\n raise ZWaveException(u"Can\\\'t find device %s : %s" % (device, traceback.format_exception(*sys.exc_info())))\\n\', \'openzwave.object.ZWaveException: "Zwave Generic Exception : Can\\\'t find device /dev/ttyACM0 : [\\\'NoneType: None\\\\\\\\n\\\']"\\n\']'
The hint was the part saying “Zwave Generic Exception : Can’t find device /dev/ttyACM0”
Supervisor -> System -> Hardware:
- serial:
- /dev/ttyAMA0
- /dev/ttyACM1
- /dev/serial/by-id/usb-0658_0200-if00
The path of the zwave UZB has been changed!! from /dev/ttyACM0 to /dev/ttyACM1
Solution:
Change the usb_path value in the zwave entry on the \config.storage\core.config_entries file to be “/dev/ttyACM1”.
Save, restart and Voila 
I hope it helped someone…
Pretty sure 