Check firmware version of RE200 on Status page of its web interface. PCs can connect to main router's Wi-Fi and access internet? Extender's SSID is different from main router's SSID or they are the...

You may share how you solved it. :)

The version displayed on utility may not change after successful firmware-upgrade. Read my explanation here....

PA451KIT and WPA4220 are compatible with each other indeed... But only WPA4220 has Wi-Fi function. http://www.tp-link.com/en/faq-258.html

According to your description, it should have been upgraded successfully. No worries...You may read the explanation below. The firmware of powerline adatpers like PA4010 is composed of PIB and NVM. A...

Powerline extender will broadcast Wi-Fi signal if Wi-Fi function is enabled. But to access internet, you have to ensure that it is paired with the one connected to the main router and they can...