TOTTI91
If this is the common 3.5" USB IPS sensor panel / Turing-style screen, the “Device not connected” message on Windows 11 is usually a USB driver or wrong-software problem, not the display itself. Windows 11 25H2 can run these panels, so Windows 11 alone is not the issue.
Do this in this order:
Close the screen software completely and unplug the 3.5" panel.
Open Device Manager → View → Show hidden devices.
Expand:
Ports (COM & LPT)
Universal Serial Bus devices
Universal Serial Bus controllers
Plug the screen back in and watch what new device appears. Ideally you should see something like USB Serial Device (COM3/COM4/etc.). A recent fix reported on the Turing forum is to uninstall that USB Serial Device, reboot/reconnect the screen, and let Windows reinstall it automatically.
If you see USBMonitor, libusb, WinUSB, or something installed by Zadig, right-click it → Uninstall device and tick Delete/remove driver if Windows offers it. Then unplug/replug the screen. Installing a libusb driver with Zadig can cause the original USBMonitor program to start reporting “Device not connected.”
Connect it directly to a rear motherboard USB-A port, preferably USB 2.0/normal USB-A for testing. Avoid hubs and USB-C-to-C for now. Some users report these 3.5" units are picky about hubs, USB-C-to-C connections, and even whether the USB-C plug is pushed fully into the panel.
Important: don't install random Zadig drivers yet. First we need to see what Windows detects.
There is also another possibility: some 3.5" screens that look identical to a Turing Smart Screen aren't actually the same hardware. In that case the Turing USBMonitor application will always say “Device not connected,” while the XuanFang software may work. That exact situation has been reported with these panels.
Send me a screenshot of Device Manager while the 3.5" panel is plugged in, especially Ports (COM & LPT) and USB devices/controllers, plus a photo/screenshot of the software you're using. I can tell you exactly which driver/device entry needs fixing.