I ordered a few of the HomeSeer HS-WD200+ Z-Wave Plus RGB smart dimmers early today.
Just a while ago I happen to come across a video tonight saying if you don't use a HomeSeer hub, then the only option to update firmware on their device is to purchase their *HomeSeer Z-Flash Z-Wave Firmware Update Kit ($49.95).
They have a software-only version if you already have a Z-Wave dongle that would work:
As for "Compatible with .hex and .hec OTA files from most Z-Wave product manufacturers." I would believe it... But most manufacturers do not make those files available...
@snell Thanks for that info.
I don't own a Z-Wave stick, so I guess if I really need to update the firmware on the HomeSeer dimmer switches I'll break down an order one of their Z-Flash Z-Wave firmware update kit.