close the utility and re-open it? try to change another USB port on the PC? If still no success, use windows utiltiy directly and do not use tp-link wireless utility.

Hi, I emailed tp-link support some days ago about this issue. They won't update the driver to support the newer Linux version. It seems the chip-maker does not support Linux any more, so they can't...

ricsip wrote Hi. Are you TP-LINK employee or just an ordinary enduser like me? an enduser like you. I emailed tp-link before about the same model and they provided me one beta firmware perhaps. If...

what's your OS version of your Mac? better to check whether it 's supported on tp-link official website.

try to download and install the latest driver from tp-link official webstie. How about the speed on your other devices? Sometimes, too many devices or applications will also affect the speed.

Is the WAN IP address public ip address on TL-MR6400? Make sure the router's WAN IP address is public ip address. Set a DMZ for the machine to see whether it works.