@DvGxVN It certainly seems to be evident that T4U usb 3 port is faulty or no connection is established with the usb 3 connectors of PC in spite of being connected to usb 3.... Its happening to me also... T4U usb 3 port is blocked somehow by tplink.. So port is getting connected by usb 2 mode. You should investigate why it is not getting connected by USB3 mode... The answer is simple... Usb3 connection is blocked in archer T4U. Now the question is whether TPlink will enable it via Dongle firmware update or not? Note this is not the Windows software, it is the firmware of the T4U hardware that needs to be fixed... If the internal connections of T4U's USB3 connectors are cut off during manufacture, then no firmware can correct this fault... So if T4U gets truly connected in usb3 mode in future then we all will get at least 100MB to 108MB per sec of transfer speed (equivalent to at least 800Mbps at 5GHz ac mode)... I am not talking about internet speed.. because if your internet speed is 400Mbps you will get 400Mbps, if your internet speed is 1Gbps you will get 866.7 Mbps....which is equivalent to at least 100 to 108 MB per sec.. TP Link should state that T4U v 3.2 works only in usb2 mode as of now..

  @zotyola 

 

Hi,

 

What is the exact version number of the driver you have installed?

 

The Archer T4U V3 definitely supports USB 3 ("SuperSpeed") mode. I own one of these myself and have reached data transfer speeds that are higher than what USB 2 is capable of.

 

But note that there are some conditions under which the T4U V3 (and most other USB Wi-Fi dongles that use chips from the company Realtek) do not switch to USB 3 mode.

 

1) There have been many versions of the driver over the years, but commonly the behavior is that the dongle defaults to USB 2 ("High-Speed") mode right after it has been plugged into a USB 3 port and also when the dongle is connected to a 2.4 GHz Wi-Fi network.
Usually only when the user establishes a connection to a 5 GHz Wi-Fi network does the dongle initiate a switch to USB 3 mode. (indicated by a distinctive sound in Windows)

 

2) Versions of the driver that are provided directly by Microsoft (either preinstalled in Windows or via Windows/Microsoft Update) appear to have USB 3 mode completely disabled, as I have never got those to switch to USB 3 mode.

 

3) Various companies have been making USB controller chips for computers and each of them has had several variants of them over the years and it could indeed be possible that some odd USB controller has compatibility issues in combination with T4U V3.

 

Anyway, if I run a program called "USB Device Tree Viewer" it shows the following information when my T4U V3 was just plugged in or is connected to 2.4 GHz Wi-Fi:

 

Vendor ID                : 0x2357 (TP-LINK Technologies Co., Ltd.)
Product ID               : 0x0115
Manufacturer String      : Realtek
Product String           : 802.11ac NIC
Serial                   : 123456
USB Version              : 2.1
Port maximum Speed       : High-Speed (Companion Port 3-3 is doing the SuperSpeed)
Device maximum Speed     : SuperSpeed
Device Connection Speed  : High-Speed
Self powered             : no
Demanded Current         : 500 mA
Used Endpoints           : 6

 

And the following is shown when I connect it to 5 GHz Wi-Fi:

 

Vendor ID                : 0x2357 (TP-LINK Technologies Co., Ltd.)
Product ID               : 0x0115
Manufacturer String      : Realtek
Product String           : 802.11ac NIC
Serial                   : 123456
USB Version              : 3.0
Port maximum Speed       : SuperSpeed
Device maximum Speed     : SuperSpeed
Device Connection Speed  : SuperSpeed
Self powered             : no
Demanded Current         : 504 mA
Used Endpoints           : 6

  @woozle 

My exact model version: Archer T4U(EU) Ver:3.20

The Driver Version : 1030.44.1014.2024 Realtek Semiconductor Corporation -the latest in existence !

I have already tried with older ones and with what tp-link originally offers : Archer T4U(USEU)_V3_181023_WIN

Unfortunately, even after connecting to 5G, it displays these data :

VendorID_0x2357(TP-LINKTechnologiesCo.Ltd)

ProductID_0x0115

ProductString_802.11ac NIC

Serial_123456

USB VERSION : 2.1

Port maximum speed : High - Speed

Device max.speed : SuperSpeed

Device Connection Speed : High - Speed

Self powered : no

Demanded Current : 500 mA

Used Endpoints : 6

  @zotyola 

Version 1030.44.1014.2024 happens to be one of those that are distributed via Microsoft and don't support USB 3 (I have tested it myself), even if you might have downloaded it on some third-party driver collection website.

https://www.catalog.update.microsoft.com/Search.aspx?q=realtek%20usb

 

The latest version that was not distrubuted by Microsoft shoud be 1030.44.0408.2024. This one supports USB 3 mode on all four computers I have at home.

https://community.tp-link.com/en/home/forum/topic/509006

 

You may have to reboot your computer after installing the driver in order to have everything working correctly.

 

  @woozleUnfortunately, I already tried this and it didn't work ! ! !

Yesterday and the day before yesterday, I read all the comments related to the topic and I tried what I found, but it didn't work ! !

  @zotyola 

 

Then either something else is not right or the driver somehow refuses to work with the USB3 host controller of your computer. Perhaps someone from TP-Link has an idea.

 

By the way, in case you have another computer in your possesion it would be worthwhile to test if the T4U switches to USB3 mode on that computer, to make sure the T4U itself is alright.