What version of hardware firmware is required to be compatible with the new CO2 Sensor?

Hardware 

Compatible Firmware Version

Blue Gateway

Yes

5.7v or newer

Blue Fan Node

Yes

8.21v or newer

Blue Fan Node Radio

Yes

8.14v or newer

Blue Cable Node (CN08)

Yes

(Vertical Board) .25v or newer (Cable Node Expander) .59v or newer