@David-TP When I reset it, it goes to solid yellow, and then to solid red. 

I'll check out the firmware thing and see if I can do that.  I know I can't access it at all via the app because the app can never find it because it's in "death mode", lol

  @David-TP Well, those instructions would be helpful if I had two ethernet ports.  I have to have the inoperable deco plugged in AND I need internet access.  My PC that has ethernet ports is a regular pc; it doesn't have wifi.  So with the deco plugged in, I can't actually go to 192.168.0.1 like they want me to, because I have no internet access.  In order to do that, I have to uplug my deco.  So the instructions are a bit lacking.

I did both methods. Method 1 can be performed without needing internet access after you've downloaded everything. But, when I do that the light comes on yellow and stays yellow indefinitely. Firmware never starts to download.

  @David-TP ok, thanks. 

  @Flying_NEB 

Hi there,

I'm sorry to hear about the issues you're experiencing with the Deco M5 unit and the red light of Death. It seems like the unit you're having trouble with may be faulty. Since the other two units are working fine, it suggests that there might be an issue specific to that particular unit.

In terms of warranty, it would be best to check the documentation or contact the manufacturer to determine the warranty period and if the unit is still covered. They should be able to assist you further in getting a replacement or resolving the issue.

It's understandable that you're concerned about the unit going bad after just 15 months, especially if you haven't had similar issues with routers in the past. I recommend reaching out to the manufacturer's customer support for guidance and possible solutions.

I hope you're able to get this resolved soon.

Best regards,

  @Flying_NEB So, after multiple trouble shooting tips provided here did NOT work, I was going through the warranty service and I tried setting it up one more time and low and behold it worked. Don't know what changed.  But it's all good now...after trying to reset it a half dozen times.