I recently purchased the Archer A7 off Amazon and when I tried setting it up in the quick start through tplinkwifi.net I always got stopped during the quick setup when it tries to Save on the summary screen. It says Failed with a red frown face saying the internet connection is not set up. I am going with Dynamic IP which is from the auto-detect. On the modem both the 2.4 and 5.0 Ghz icons are lit up as well as the wifi one (but it is orange for slow speed). It is an ethernet I run from the wall and it works fine if I just run it straight to my device but not if I use the router first (because I can't set up the friggin wifi!). I've reset/restarted multiple times, tried different settings on the start-up but it still doesn't work. It has to be the router as it works if I just run straight ethernet.

Thanks for your help!