Hi there. 

I current have a Deco X20 Mesh network at home consisting of five AX1800 Deco X20. All are v4.0 and all were working fine until I recently added a sixth X20. It was fine also for about a day but then disconnected from the network suddenly and won't reconnect despite several attempts. Strange also is that when I went to unplug it, the indicator was green (I had expected it would be red?) but the Deco app still said it was offline. 

On investigation, I noticed this new hub - one of a pair purchased from Amazon as a twin pack - are Version v3.0 units. 

My question is, are the two versions compatible or could there be some conflict going on here? I noticed there is a new firmware available - 1.1.1. available Should I update the whole network with this maybe?

Many thanks if anyone can assist with this dilemma!