Hi @Solla-topee 

Please see my reply as per below:

 

• Install the latest offical driver for the TX20U Plus. 

   - Currently using the latest and greatest official driver for the TX20U Plus.

 

• Make sure you have disabled the built - in or other Wi-Fi adapters, from the photo the adapter information does not seem to be of TX20U Plus adapter. 

  - TX20U Plus is the only adapter that connected to my system. The photo was the actual adapter info for TX20U Plus that's why I'm asking help to fix the issue.

 

• Please confirm the Wi-Fi router supports MU-MIMO in the router specifications. 

   - The Wi-Fi router is TP-Link Archer AX73 with MU-MIMO enabled. I don't think the router/network was causing the issue as other adapters like Archer T3U and Archer T4U both working without any issues on the same router/network.

 

• For the number of TX/RX spacial streams, try to adjust the router's Wifi Channel width to higher channel width like 2.4Ghz : 40Mhz, 5Ghz: 80Mhz. 

  - Channel width was confirmed 2.4Ghz : 40Mhz, 5Ghz: 80Mhz.

If still the same, 

For the Mu-MiMO,  may I know the model of the router &  a photo of the driver date & and PC motherboard information.

- Router: TP-Link Archer AX73 V1.0 with latest official firmware. Motherboard: Asus P8H61-M LE/USB3

 

For the spacial stream ,you may share a photo of the router wireless settings and check what is the Wi-Fi link speed between router and the TP-Link adapter and share a photo. 

 

Wi-Fi Link Speed:

 

 

 

Thanks.

pclui wrote

Apparently, MU-MIMO is not ready on TX20U Plus using TP-Link provided driver version 5001.0.13.106, dated 23/12/2021 on Windows 10 21H1. Enable DL MU-MIMO on adapter properties advanced option also didn't help.

 

The Tx/Rx spatial streams seem like not working correctly.

 

Please help to rectify the issue.

 

Thank you.

 

  @pclui 

I confirm this problem exists. I do not observe the effect of turning on the DL MU-MIMO flag. The netsh wlan show wirelesscapabilities command outputs: MU-MIMO : Not supported Number of spatial streams Tx : 1 Number of spatial streams Rx : 1 Number of simultaneous channels supported : 1

  @David-TP 

Yes, with this driver information about the adapter is displayed correctly.