I attempted to move from my still working single station Asus Router here at home to the Deco M9 Plus yesterday and it was a nightmare...... All Mesh units did get installed and Firmware updated. I then used the exact same Wi-Fi Name & Password I have ben using for 4 years..... I havee at least 48 Wi-Fi Devices connected.... which include 15 IoT Wall Switches, multiple wall plugs and 6 Alexa Devices and multiple laptops.
Upon Power cycling after instalaltion, I found the majority would not connect.... I then methodically checked all my settings, but still no joy....
Why would some connect, but not others? A Chat with Support suggested I Test by moving one of the DEvices to the GUEST Network... still nothing, then Change my password from 10 Alpha-Numeric to 11 characters... I just added an "x" at the end... and it Worked! But why? When I inquired of the CSR what was the Password Requirements, he could not tell me... said its not specified.
I then tried changing the Password on the single Echo Show device that would not connect... and it still would not. Tried full factory reset of it with no luck.
I then tried 2 of the IoT Wall Switches.... nothing!
a 2nd Support chat yeilded no help to resolve......
I then removed all the DECO devices and Reinstalled my Asus and everything went back to full working operation.
I've now RESET Every Deco device back to Factory, and removed all the APP's from my phone and reinstalled it.
I'm going to start from scratch again, but wondered... If I set up this DECO Mesh with again, the same Wi-Fi credentials that are currently imbedded with every device I have, should not every device I have readily connect to the New Mesh?
I don't belive I need to RESET every Laptop, IoT, Alexa, etc.
Suggestions are welcome and appreciated.....