@Enri2020 Hello, thanks for the info. Please uninstall the driver on your computer first, then click here to download the driver, turn off the firewall or antivirus, follow the instruction below to...

@Leo_V.M. Hello, are you using the TL-WN881ND V2 on Win10? When did you buy the adapter? Does it work fine before? You can try to insert the adapter into another slot then reinstall the driver. Or...

@RyanNL Hello, please refer to the instruction below to do some settings. What's the operating system of your computer? https://www.tp-link.com/support/faq/2743/ Good day.

@Peter1959 Hello, what's the model number and hardware version of your adapter? What's the distance between the adapter and the router? You can try to change the router's 5G channel to 36,40 or 44,...

@assamcarrers Hello, what's the model number and hardware version of your adapter? Please refer to the instruction below to check whether you installed the driver successfully or not....

@TiPiLinkBuyer Hello, you can use the driver for Archer T4U V3 below. https://www.tp-link.com/support/download/archer-t4u/#Driver