Setup is done in the Deco app. A pulsing blue LED means the Deco is ready for setup and a solid blue means it is setting up; solid yellow means starting up, so wait one to two minutes. Plug the main Deco into the modem, follow the app, and choose your home layout so the app can guide placement. A solid green or white LED means the Deco is registered and all is well. If the main Deco fails to complete setup, TP-Link has a dedicated article; sensible first steps are to power cycle the modem, check the Ethernet cable and that only the main Deco is on the modem, and reset the Deco with its reset button, pressing it for one second.
If the app cannot find the Deco, use TP-Link's separate article on that message.
The checks in more detail
In Router mode the main Deco is the gateway; if an existing router sits in front, choose Access Point mode instead, which disables gateway features such as parental controls, QoS and port forwarding. After setup, update firmware under More, System, Update Deco and place satellites using the signal check. You will need a TP-Link ID for the app. Before you start, write down your provider's name, the modem model and any account settings the provider gave you, and decide where each Deco will go.
A tidy first setup avoids repeat resets, and after it finishes, take a screenshot of the Wi-Fi settings so you can restore them if you ever need to start over. Setting up on a phone that is on mobile data rather than another wifi network avoids confusion, because the app then needs to talk to the Deco directly during setup.
Differential
Likely causes of “TP-Link Deco mesh wifi will not complete setup”, and how to tell them apart
- 1
A modem that needs a restart
What separates it The setup stalls because the modem is not responding and needs a restart
How to confirm Power cycle the modem, wait for it to start up, and then run the setup again
- 2
A satellite plugged into the modem
What separates it There is a red light because a satellite was plugged into the modem
How to confirm Use the main Deco for the modem connection, and set up the satellites afterwards
- 3
A unit that was set up before
What separates it The app cannot find the Deco because a unit that was set up before is still configured
How to confirm Reset the unit, and then try the setup again from the beginning
- 4
A previous setup on the unit
What separates it The unit is not in setup mode because it still holds a previous setup
How to confirm Reset the unit, so that it pulses blue and is ready to be set up
- 5
An existing router
What separates it There is a double NAT because an existing router is still routing in front of the Deco
How to confirm Use Access Point mode on the Deco, or bridge the existing router
Before you touch a setting
Record this first — changing settings destroys the evidence
- The color of the light on the Deco during setup
- The step of the setup where it stops
- Whether your TP-Link ID signs in to the app
Try in this order
0 of 7 completedPlug in the main Deco
ReversiblePlug in the main Deco, connecting it by Ethernet cable to the modem before you begin.
Wait for pulsing blue
ReversibleWait for the light to pulse blue, which shows that the Deco is in setup mode.
Open the Deco app
ReversibleOpen the Deco app, and sign in with a TP-Link ID, creating one if you do not have it.
Choose the layout
ReversibleChoose the layout of your home, so that the app can give you guidance for placement.
Update firmware
ReversibleUpdate the firmware by going to More, then System, and choosing Update Deco, and then test again to see whether it helped.
Add satellites
ReversibleAdd the satellites, and check the signal to each one, before you finish placing them.
Reset if stuck
ReversibleReset the Deco if the setup is stuck, by holding the button for one second.
Model-specific
What is true of this model and not of its siblings
- Model differences
- The M5 uses solid and pulsing LED patterns of the older tables, while the X and BE series add pulsing green for firmware upgrades.
- Web UI
- Some models support a web page at tplinkdeco.net.
- Other models this page answers
- These steps also fit the Deco BE63 mesh, Deco XE75 mesh, Deco X55 mesh, Deco M5 mesh.
Stop boundary
When this stops being a self-service repair
- !If setup fails on another phone after a reset, contact TP-Link support
- !If the provider needs settings, get them from the provider
- !If the unit never shows pulsing blue, replace it under warranty
Evidence ledger
Sources behind this answer
Setup failures.
Every LED color and pattern by model.
Reset versus reboot and the app and button methods.
Modes and features.
The company and its products.
Exact questions
Common questions
What does pulsing blue mean?+
Pulsing blue means that the Deco is ready to be set up in the Deco app.
How do I reset a Deco?+
Press the reset button one second or remove it in the app.
Do I need an account?+
Yes, you need a TP-Link ID, which you create in the app when you first sign in.
What is Router mode?+
The main Deco is the gateway.
How long does startup take?+
One to two minutes on solid yellow.
Can I set up without the app?+
The app is the normal route.
Where do I update firmware?+
You update the firmware in the app, under More, then System, and then Update Deco.