I just upgraded to 2.2.4 and installed the Firmware Updater App. I can see the Firmware file manager but don't have the option for 'Update Z-Wave Firmware', as depicted here.
Do you have to upload the firmware first before getting the update button? I am assuming you did add a firmware file?
Are you using Google Chrome Canary?
I ran into that same scenario with a build of Google Canary, however it works just fine using a regular Google Chrome I had or Microsoft Edge (shudder).
Bryan was going to be looking into the problem to try to find what might cause the difference.
Yes there is something wrong with Google Canary, Works with EDGE/Chromium.
Are you on a C7?
No, still on C5. Waiting for the Migration service to be launched to port over to my C7 (too many devices to manually do it).
I was actually using Safari, but I just tested on Chrome on OS X and also on Edge as well as Chrome on Win 10 (running in Parallels) ; same behavior all across.
What version of 2.2.4 are you on?
If you're on 126.96.36.199, revert back to 188.8.131.52, the .142 release "has issues" and HE is going to release a replacement for that update today.
If you're on 184.108.40.206, try removing and re-adding the app.
From the 2.2.4 Device Firmware Updater release notes:
Due to limitations in the old Z-Wave stack this feature is currently C7 only.
Doh (on my part) thanks