I updated my 2020 CX-5 v70.00.367 NA N to 74.00.311 NA N a couple weeks ago hoping to fix a couple annoyances (Sirius XM related) and no change. Search this forum, there is a user that will provide the firmware if you message directly.
Ok but isn’t there a newer os update? no, this is for the older style system unless ASH8 or someone else has whatever you're looking for. if your system is functioning fine then don't worry about updating
Just installed it in a 2017 ND, nil issues on install and works great. Definite improvement in response to commands (I had 59.00 firmware prior to this and installed latest 74.00 directly with no older versions required first, it was as smooth as can be.) Now to install the new hub and cabling and get CarPlay working.
Big thanks to Ash8