@Alexandre. 

Ok, so Step 1 says “… download the upgrade utility on your computer.”. What sort of computer would that be? I have all Apple devices, no Windows devices.

Further down Step 1, the link for the M9 Plus v2 takes me to the Utility page with a download option for macOS - v1.2.0 - dated 2021-03-25.

So my question is - will this utility allow me to download a firmware update of version 1.4 or later, and presumably the latest firmware update of 1.6.3 Build 20231225 to my M9 Plus V2 devices?

I know from past experiences of many years ago, that firmware updates have to be treated with respect. You get just once chance to get it right or get a bricked device.

I await your reply to the above.

  @retired_user 

I think you should just try. The whole point of that utility is to update M9 Plus V2 with firmware 1.2 to newer firmware.

  @retired_user  Go to to the top left of the deco app and go to view account. Go to app settings click on notifications turn on firmware updates. It will then notify you when a firmware needs to be updated then push update when it notifies you.

Alexandre. wrote

  @retired_user 

 

I think you should just try. The whole point of that utility is to update M9 Plus V2 with firmware 1.2 to newer firmware.

 

  @Alexandre. 

OK. Against all my training, and better judgement, I did exactly what you said, and tried.

I regret to say it was a no go.

Followed all the instructions, including the FAQ about "Cannot find main Deco", and I have been totally unsuccessful. I have no idea why it didn't work. But I'm not prepared to compromise a working network, and all the settings I had configured and reconfigured, in order to try again. Unless you, or someone else, knows how to make it work on an M2 MacBook Air running macOS Sonoma.

So, thank you for your assistance thus far, and it's time for me to move on to Plan B, to integrate TP-Link XE75 Pro units in to the Deco mesh network, before making one of them the main device in the Deco network. Thereafter, it's a case of decommissioning the M9 Plus devices. Net result will be an upgraded Deco mesh network without having to reconfigure the myriad of devices that connect to the network via wifi.

  @ImtiazAli I followed the instructions provided with the update utility. I even had the update .BIN file in the same folder as the utiilty program. I isolated main Deco from the internet at the rest of the mesh network, as well as powering it off and then on. I connected the main Deco to the MacBook using a shielded ethernet cable. The MacBook and the main Deco were only a few centimetres distance from each other. And yet the utility said it couldn't find the Deco. Go figure, because I can't. So to repeat myself - what am I doing wrong?

  @ImtiazAli 

Thanks for the quick reply.

So, just to confirm, you are suggesting that the main Deco is kept connected to the internet via its cable connection to the router, and via wifi to the rest of the mesh network?