@robi217 I have contacted TP-Link, they send me a beta firmware, it works for me. https://static.tp-link.com/2020/202005/20200507/Archer C6(EU)_V2_200507_beta.zip They say this beta has rolled back...

I just bought an Archer C6. In the first week, it works fine and I’m satisfied with its performance and Wi-Fi range. I would say it’s perfect at this price. But the situation becomes worse after one...

It may have another 702N on your network, so when you try to login, it has been redicted to the web of 702N. You can clear the cache and it will show the exact model.

Do you have a public IP? If you have a reserved IP, you cannot login remotly. https://en.wikipedia.org/wiki/Reserved_IP_addresses