Hi, we are sorry that we do not understand your quetsion due to the languagae barrier, would you please re-send the details of the current issue in English and then we can continue to help you?

First, you can restart the router and try to use the default and custom username and password to login; If does not work, you may change another web browser or device and give it a shot. Otherwise,...

In the utility, how about the link speed between each unit? Would you please send me the picture of the utility which shows the connection status between the units

Are you used the Android phone? If yes, it's suggested to use a iPhone to setup the KC120 and the google home work together.

Hi, You can try to update the firmware manually. Please have a windows computer to follow the instructions: 1.Make Sure the computer and the smart plug are connected to the same router/modem....

The TL-WPA4220KIT is not Pass Through format, if you need the wireless extender is Pass Through format, you can try the TL-WPA4230P KIT. If you need the wired adapter is Pass Through format , you can...