When you say “change a byte“ do you mean “configure a parameter“? That is, change the setting in the firmware in the device?
If so, and this is a one time change, and these are Z wave devices, then you can do it with the “Z wave Tweaker” DTH. You temporarily assign the Tweaker To the device using the web interface to your smartthings account (the “IDE“). This will then show you all of the currently changeable settings when you look at the device details in the smartthings app. You make whatever changes you want using the Tweaker, and save them. And then you switch back to the original DTH for every day use.
This will work with any mains-powered certified Z wave device.
See the following thread (the topic title is a clickable link)
