Note that the Hubitat Device Firmware Updater app is not currently able to perform firmware updates for these Leviton devices. You will need to use a Z-Wave stick and PC Controller to perform the ota upgrade. If you don't have experience with PC Controller, I recommend waiting until Device Firmware Updater is updated to work with these devices.
Device Firmware Updater still doesn't work, but the Z-Wave Firmware Updater driver worked for me!
One additional item, if you are using the "Leviton DZ6HD Z-Wave Dimmer" driver, I recommend switching to the "Generic Z-Wave Smart Dimmer" driver. The DZ6HD specific driver appears to have a bug in which it queries the device for updates twice rather than just once. For the DZ15S, I use the "Generic Z-Wave Smart Switch" driver.
Curious why "Generic Z-Wave Smart Switch" instead of "Generic Z-Wave Plus Switch"?
