I am going to buy z-wave thermostats for electric heating control- Heatit Z-TRM2fx and USB stick Aeotec Z-Stick Series 5 to control device.
I guess that would need to update firmware because of some previous bugs. Heatit provide .ota file for firmware update. Do you know how to update firmware? Is this possible by Home Assistant? If not is there any free tool? I just found HomeSeer Z-Flash for 15$ and not sure if this is compatible https://shop.homeseer.com/products/homeseer-z-flash-z-wave-ota-firmware-update-software