@woozle Thanks for the fast reply. I tried it in another Win 11 machine and it shows up differently there and after I eject that fake CD drive it then shows up as a WiFi adapter and works okay on my network. I have to go just now, but I'll do some more testing later. Very strange

Screen shots from the second computer below, FYI

  @woozle Hi again, as I showed, it works (but not okay because it initially shows as a CD ROM) in another Windows computer but not at all in the one I purchased it for. Everything else works in my computer. Please advise how to fix this. I received a Win 11 Version 25H2 (OS Build 26200.5074) update the other day and that didn't fix it either.
Edit: I ran the DISM restore health and the SFC scan checkers again, rebooted and there's no change.

Thanks and regards,

Paul

  @woozle Sure, Device status: Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)

Object Name not found.

Screen snips below in case these help further:

  @woozle Thanks for your help. I had already uninstalled the device and rebooted and redetected the device several times but that didn't change any of the above. I had also googled the guts out of it without joy, just lots of rabbit holes and offers to buy stuff I don't want or need. Google results are not much more useful than random shopping lists these days, in my opinion.

I have it working now, at WiFi 6 (802.11ax) mode on 6 GHz at least. Can't get it to talk in WiFi 7 (802.11be) mode yet. What I did:

1. With the device unplugged, in Windows 11 System Recovery I chose the item "Fix problems using Windows Update", the clicked Install now, and let it do its thing. Took a long time of course. 
2. After the final reboot and letting the system settle, I inserted the device into the USB 3 port, it then added the "RTK Driver Storage USB Device" driver (that's so weird and not documented in the user guide) without error, the device status shows "This device is working properly".
3. I detached the fake drive D: it had created in Windows (I peeked in the drive, it contained AutoRun.inf and SetupInstall.exe), then Windows created a new Network Adapter in the Device Manager, called "TP-Link Wi-Fi 7 Wireless USB Adapter", and the Device Status shows "This device is working properly". I also noted that the status light on the WiFi device has now lit up.
4. I had a look in Network & Internet > Wi-Fi settings in Windows, and saw there were two Wi-Fi adapters, the TP-Link adapter was Wi-Fi 2, so I turned off the other adapter.
5. Then I was able to show my network list and selected my 5 / 6 GHz Wi-Fi 7 AP to connect to that. The AP is a TP-Link EAP772 BE9300 Wi-FI7 device.
6. The TBE400UH Wi-Fi device connected to the AP ok at 6 GHz, but windows shows it's configured to ax mode (WiFi 6) instead of "be" mode (Wi-Fi 7). Windows shows the adapter driver version is 5002.24.126.2 and the Aggregated Link Speed is 2882/1153 Mbps, which is the device's maximum speed I think(?).
7. Note that my Samsung Galaxy S25U phone does connect to my WiFi AP at WiFi 7, so the AP seems to be correctly configured but the USB WiFi 7 device won't talk in WiFi 7.
8. When I shut down & restarted my PC, the USB dongle reconnected to WiFi after Windows login, so long as I don't detach the dongle. If I detach the dongle then reattach it later, I have to do the "CD-ROM" detach thing again, which isn't intuitive.

Anyway I hope this helps. It's working now sort of, but not in WiFi 7 mode, just WiFi 6E. Same on the other computer.

Cheers,

Paul