@Alexandre. ha ha. Missed the 1-2 day bit. And I'm impatient. All good now though. They took about 15 mins to come back online but all good now. Thank you. I'm leaving wel alone now as all working...

Mall done. Thank you so much

App reporting that all devices are using the old firmware, which they are not. Will manually update garage unit now.

@Alexandre. No it is not connected via Ethernet. Only the main Kitchen Deconis connected by Ethernet. thank you. I will update manually as does not seem able to be done via app.

Also, it appears the clients in the garage (garage doors, lights) are still connecting to the kitchen Deco rather then the garage Deco. The kitchen Deco is about 12m away through multiple walls...

I have 4 Deco M9 plus units creating the mesh network. For some strange reason the latest M9 Plus just added shows a different firmware version to the other 3 (1.2.11 vs 1.5.6) and in the main...