@Kevin_Z Thanks for your advice. I configured the RE450 on the web UI, (I tried manuel and auto install) and it did show the 5GHz of the Archer C7 to select but when saving the configuration, no MAC...

I'm triyng to connect the Archer C7 V4 with the extender RE450 V2. Only the 2.4GHz light is on. In the setting on the RE450 , it shows no 5GHz signal for the Archer C7 but in the setting of the...