Usually gets set the first time the device initializes with the driver, what happens if you hit Configure?
hit configure, and this field showed up:
- numberOfButtons : 8
I'll try to re-add the '0' fw driver once the room is empty end of day. Don't want to hear any complaining if the light goes off during a FW update. 
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I know this is a relatively old thread, but I just wanted to chime in with my experience. I had the same error about the transferred image not matching. Zooz Zen32 Scene controller, using built in firmware updater on C7 hub. Excluded device, re-paired without security, and firmware update was successful. After that, excluded, then re-paired with s2 security. Kind of a pain, but not terrible.
Yeah, the built-in updater has issues with S2 (not sure about S0) devices... As you found out, if you remove security, the update then typically works fine.
I just have one device on S2 -- a Zen17 (it's for my GDO) - I put it on S2 after the latest Z17 update but before I knew about this issue, so now I have regrets...
Zooz's Z17 firmware is now pretty well established & stable, but I'm dreading a future update. This a good reminder I should probably just remove S2 from it before winter hits (gets cold out in that detached garage if I have to take off all those small wires in order to bring it in the house closer to the hub).
