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I got a Netgear Extender WN3000RP that works fine with my old router from Technicolor.
Recently I bought a TP-LINK Archer C9 and replaced my old router.
How ever I need (like before) extend my WI-FI.

During the connect phase the Extender finds the Archer C9 and I can go through all steps, but at the last step when all is set and I confirm, the extender says I need to move it closer to the router. I even have tried to to do this half a meter away from the router, but no luck. If I try to extend my old router it works fine even if I'm over 15 meters away from it. Are there any settings I can change to make this work better?

I do not think my extender is a dual band extender.
Other devices can connect to the Archer C9 without problems.

Do you guys got any solution?
Best regards