@Muffinman Thanks for the quick reply. Yes, the main router is connected in copper, but the substance does not change. I live in EU, but I can't find the firmware 1.3.3 on the TPLink site...

Hi, I recently bought a used Archer AX55 v1.0 router. The router works great, except for one thing, a little strange: although the internet is available and everything works fine, the router "says"...