@newdecobe25user This is the reset instructions:

How to Reset Deco: Reset or Reboot Your Deco Whole-Home Wi-Fi System | TP-Link

You may want to try to clone the Spectrum router MAC address onto the Deco you connect to the modem.  See Step 5

TP-Link Deco Solid Red Light: Causes and Fixes

  @jzchen 

Thanks, but that didn't fix it.

After everything I've done, it keeps coming back to Spectrum and their stance that tplink doesn't work right with Spectrum.  This after burning through all of the troubleshooting steps on the deco website, after changing modes and settings and trying each unit as the 'main' unit, no matter what seetings I've tried based off the forums and some digging on reddit, and after having spectrum service show up at our house and confirm their system works fine but still tried a new modem just to shut me up. Plus 3 trips to best buy for ethernet cable to try connecting my wife's office with a new cable, replace the deco cable that came with the deco router (per deco tech support) plus 2 more cables to try connecting the satellites directly (reddit) 

After all that, here's what I have:

Old modem, old router (dbit):  Everything works, range is bad.

Old modem, new router (deco):  Everything works (but not raspberry pis) but constant signal loss and requests to re-login form all devices. 1 satellite works the same, the other one is almost always red.

New modem, old router (dbit):  Everything works, range is bad.

New modem, new router (deco): Nothing works, only red light in ap mode or router mode with or without cloning old router mac address.

New modem, new router (spectrum): Everything works, just plugged it in and it stated working. No connection issues.  Lousy range.

New modem, new router (spectrum), new router (deco) plugged into new router (spectrum):  Green light in ap mode only, frequent connection loss for everyone connected to the deco wifi or wired connections.

New modem, old router (dbit): Everything works, range is bad.

New modem, new router (spectrum), old router: I haven't bothered trying.

App settings I've tried:

Guest network: disabled

IoT network: disabled

Network optimization: Tried it a couple of times. Force closed it the first time after about 5 minutes, after over an hour the second time.  Just a spinning blue radar screen.  Maybe this not completing is the issue?

Test internet speed: 942Mbps

Operation mode: Currently access point, just so it gives a green light. Router mode only gives a red light.

Wireless network mode: Stable mode  "Ultra speed mode" behaves the same as stable mode.

Smart DHCP: Currently Enabled, but same behaviour if it's turned off.

Fast roaming: Diabled (no difference if on or off)

Beam forming: Disabled (no difference if on or off)

Satellites - Currently off, but frequent connection drops when we were trying to use them.  Didn't matter if hard wired or wireless.

I have several raspberry pi devices, none of them has ever been able to connect to any deco.  They connect and then time out on any wifi access.

Spectrum said tplink has issues connecting to Spectrum.  This from an on-site technician who tried multiple combinations of hardware just to ensure the modem is not the issue.

Spectrum followed up with an email of 'approved third party hardware that works on spectrum internet' that does not include tplink or deco.

Deco phone room support said I need to follow the 'special' instructions, but the call qulaity was so bad I don't think he got the email address right, so I still don't have those instructions.  However, nobody else from tplink or deco can provide me with that specific set of instructions.  Maybe this is the problem.

Sorry for the lengthy reply, I've explained this setup mutlipe times and in several forums (here and reddit and a few emails) so I'm just going to copy paste this as a "here's where it is."

  @newdecobe25user Sorry to read of all your issues and all the effort made.  Spectrum is IPv6 IPv4 dual stack.  Have you tried enabling IPv6 in the app?

  @jzchen 

I'll check tonight. I'm pretty sure I left everything alone unless specifically instructed by deco instructions or tech support or email. That keeps me from 'trying things' and making it worse.  Once it's working, I'll check all the tweaks and seetings I can find to try and optimize...  but when it's having issues like this just out of the box, then I don't want to change a single thing. I'm thinking more and more this is a case of the special instructions are for the specific case of tplink+spectrum, but I don't have them.  Nobody has mentioned ipv4 vs ipv6, so I haven't changed it from whatever the default setting is.

  @newdecobe25user I am barely able to add TP-Link links to my posts and definitely fail when I try outside/third party links.  There is a web page on setting up TP-Link Deco with Spectrum.  (Of course I tried to link it on my last post but it failed).  IPv6 is separate from IPv4 so it may help narrow things down for what is the cause.  (IPv6 pages load extremely fast as well because of no NAT).

  @jzchen 

Thanks for the suggestion, but IP6 on or off doesn't matter, I only get a red light. Still the only green light is ap mode plugged into the spectrum router.

  @HelpFixDecoApp 

lmao!  "

This site can’t be reached

Check if there is a typo in tplinkdeco.net.

DNS_PROBE_FINISHED_NXDOMAIN"

I spoke with a new person from tplink today, he said he's going to 'escelate' this be cause of all the problems.  But the people who it gets escelated to apparently work second shift, so... I don't know.

But this person also said the previous person I spoke with gave me wrong information, and that I should only trust the new person, not the other person.  

Thanks for the suggestion, but I'm done.

We're returning these and replacing them with a brand that spectrum says DOES work with their internet.

Thanks again.

  @newdecobe25user 

Not sure what the SOLVED part is?

I can assure you, as I've got Spectrum 1Gbps service, it works FINE for me, and I'm a Beta Tester for TP-Link.

I've owned MANY TP-Link Router's are Deco's.

• Archer A20
• Archer AX55
• Archer A230
• Deco X55
• Deco BE65
• Deco BE68 which I am using now.

Never a PROBLEM, and had a few Spectrum Modems, now using an ET2251 Voice/Internet modem.

If you are using a Spectrum combo modem/rouiter, you'll need Spectrum to BRIDGE the ROUTER part so you can use your own router.

Specrrum will I think allow you to use your own modem or modem/router combo, On that list, there are NO TP-Link devices.

It isn't too clear to me what you did?

The modem should be off, then plug in one of the deco's. So there is a wire from the Modem to the Deco. Now turn on the modem and wait for it to fully turn on, then power up the deco. At that point when the Deco is up, configure it via the Deco App... and the light should turn green.

Then power up the other Deco's and they should connect to the main one.

.