I e-mailed TP-Link about 10 days ago and received the following reply from someone in their tech support group. Haven't tried it so don't know if it really solves problem and it's been a week since...

Maybe the following link might be useful. http://www.tp-link.com/en/faq-420.html

Model : Archer C7 Hardware Version :C7 Firmware Version : V2 ISP : I'm quite new to this forum so pls let me know if this has been deaslt with before. I have a TP-Link Archer C7 router, V2. I read...