@Tsnyde Hi， welcome to the community.

Would there be any error message when Deco M3W failed to link Deco S4?

Can I have some pictures or a small video clip about the setup process?

Best regards.

  @Tsnyde 

Thank you very much for the update.

It seemed like Deco M3W had not been fully reset before setup again.

Could you please use a pin/pen to hold the reset pinhole for 1s--then the light will be:

power light flashing white>>signal light turns from red to white, other lights white on>>only power light flashing, other lights go off>power light solid on white

Wait for your reply.

Best regards.

  @Tsnyde 

Hi, Thanks for the fast response.

I got the impression before that the reset button on Deco M3W is kind of hard to reach when you hold the pinhole and that might be the problem.

Could you please try to press the pinhole from different angles to see whether it would make any difference?

At the same time, I will follow up on your case by email in case the warranty service is required and please check whether you could get an email later.

Thank you again.

Best regards.