This link will help you. http://forum.tp-link.com/showthread.php?75985-How-to-build-a-secured-powerline-network&region=china

Without any question, TP-LINK Powerline adapters have passed all kinds of tests including Android device tests. So if this problem truly exists on your products, you can contact the retailer from...

This link will help you Configure your Powerline adapters. http://forum.tp-link.com/showthread.php?75985-How-to-build-a-secured-powerline-network&region=china If it is still not working after you...

You are lucky it is not successful. You must figure out whether your TL-PA211 is v1 or v2. If your TL-PA211 is v1, and you upgrade a v2 firmware, then your product will be broken. By the way, the...

Your WPA4220 must be broken. You can replace it with a new one.

It is very easy to debug this kind of problem. Just use TP-LINK powerline utility, and this utility will help you detect all the TP-LINK powerline adapters in the same powerline network. So please...