That is always there and only to update the region setting right by that button. The actual Firmware update would say "Firmware Update". There has not been any updates for the C8.
For testing, you could use a virtual device and swap apps to move your automations to a test device then back to the new device once you exclude and pair again. No loss to automations. You can also factory reset the device then use z-wave replace to get it back to the same node. Check this guide: [Guide] Updating Firmware and ZWave Replace
Or this...
