Thanks for your reply @Solla-topee but my issue is not about "High-Speed mode" yes I'm connected to the main router wirelessly but the issue is about a function called "Ethernet Port" which used to...

Hi, I have been using the RE450 v4 for a long time and was using the ethernet port to be connected with my home network and there was an option to select the ethernet speed between 2.4 and 5.0 GHz...