I'm in the middle of a Zooz firmware updating marathon.
Is there any other way to determine what Zen30 hardware version a device is without looking at the front plate? I really want to avoid taking all of my plates off the wall if possible.
Did someone say Zooz? 
The current firmware version will tell you.
You can reference this as well which helps match up hardware and firmware: https://www.support.getzooz.com/kb/article/393-zen30-double-switch-change-log/
For the most part the major version of the firmware indicates the hardware version.
