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Deco M9 not connecting with the rest of the mesh network

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Deco M9 not connecting with the rest of the mesh network

This thread has been locked for further replies. You can start a new thread to share your ideas or ask questions.
Deco M9 not connecting with the rest of the mesh network
Deco M9 not connecting with the rest of the mesh network
2025-08-17 10:36:06 - last edited 2025-08-21 08:21:45
Model: Deco M9 Plus  
Hardware Version:
Firmware Version:

 I have a deco M9 mesh network at home which has been working well for the past years. One of the deco M9 antennas has been disconnected (unplugged) for while. When I tried to connect it back to the network it was not showing in the app.

 

i've tried to reset the antenna (now has the blue light flickering on top), but when I go in the app to connect a devise the network is not seeing the antenna. 
I already tried to place it next to the main antenna but this did not help.

 

any suggestions?

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#1
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1 Accepted Solution
Re:Deco M9 not connecting with the rest of the mesh network-Solution
2025-08-18 08:38:57 - last edited 2025-08-21 08:21:45

Hello @Jeroen-be ,

Welcome to our community!

 

First of all, please make sure you are logged in with the owner account, not a manager account.

Is there any error message? Please try the following suggestions:

  • If you see the error "Unable to add Deco. Please try again later" after clicking "Add Deco Unit", you can wait for 30 seconds to 1 minute, then try again.
  • If you encounter the error message "We couldn't find any new Deco" or "Failed to add this device" during setup, place the satellite unit closer to the main Deco and try again. If the issue persists, close and reopen the Deco app, then try again.
  • If the satellite unit continues to flash red (disconnected from the main Deco) after setup and relocation, move the satellite unit closer to the main Deco.

 

Hope the suggestions above can help you.

 

Welcome to Community！ Urgent problems with your Wi-Fi Router, Range Extender, or DSL Modem? Please reach out via private Message or @Joesph-TP in your new thread directly. Check Out the Latest Posts: △New Firmware for Archer GE550/GE650 V1 Introduces AI-QoS, EasyMesh IoT Expansion, and More! △New Firmware for Archer BE800 V1 to Support VPN Merge, EasyMesh Guest/IoT Extend, and More △New Firmware Releases for Archer BE805/BE450 V1 to Support VPN Merge, New ECO Mode, and More Click △ Or ☆Recommended Solution if the post/answer helps.
Recommended Solution
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Re:Deco M9 not connecting with the rest of the mesh network-Solution
2025-08-18 08:38:57 - last edited 2025-08-21 08:21:45

Hello @Jeroen-be ,

Welcome to our community!

 

First of all, please make sure you are logged in with the owner account, not a manager account.

Is there any error message? Please try the following suggestions:

  • If you see the error "Unable to add Deco. Please try again later" after clicking "Add Deco Unit", you can wait for 30 seconds to 1 minute, then try again.
  • If you encounter the error message "We couldn't find any new Deco" or "Failed to add this device" during setup, place the satellite unit closer to the main Deco and try again. If the issue persists, close and reopen the Deco app, then try again.
  • If the satellite unit continues to flash red (disconnected from the main Deco) after setup and relocation, move the satellite unit closer to the main Deco.

 

Hope the suggestions above can help you.

 

Welcome to Community！ Urgent problems with your Wi-Fi Router, Range Extender, or DSL Modem? Please reach out via private Message or @Joesph-TP in your new thread directly. Check Out the Latest Posts: △New Firmware for Archer GE550/GE650 V1 Introduces AI-QoS, EasyMesh IoT Expansion, and More! △New Firmware for Archer BE800 V1 to Support VPN Merge, EasyMesh Guest/IoT Extend, and More △New Firmware Releases for Archer BE805/BE450 V1 to Support VPN Merge, New ECO Mode, and More Click △ Or ☆Recommended Solution if the post/answer helps.
Recommended Solution
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