how to fix Unknown USB device (device descriptor request failed)

Question

how to fix Unknown USB device (device descriptor request failed)

mohamed amine 0

I am having a problem with Bluetooth, as the computer cannot read it. I connected the cable via the jusb2 port. I have a ubit-ax3000e. The Wi-Fi works fine, but Bluetooth does not appear at all. I only get this error message. I have an MSI A520M-A PRO (MS-7C96) motherboard. WhatsApp Image 2026-08-31 at 20.38.45

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3 answers

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Answer 1

Kapil Arya 38,501 Volunteer Moderator

You only need to update or install the correct driver for the failing device. The driver can be obtained from device manufacturer's website.

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Answer 2

The best option is to go to the support page for your ubit-ax3000e card to download and install the Bluetooth drivers they provide to test if that resolves the problem with the unidentified USB device.

http://www.evisionde.com/prodetail.aspx?ProID=120

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Standard Disclaimer: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.

Answer 3

Unknown USB Device (Device Descriptor Request Failed) means Windows detected something on USB, but the device did not enumerate correctly. In the Microsoft USB case study, this type of failure is associated with enumeration problems, and in Device Manager it can appear as an unknown device.

For the Bluetooth part of the UBIT-AX3000E, try this order:

Test the USB connection first.
- Since Wi‑Fi works but Bluetooth does not appear at all, the Bluetooth side is likely the USB-connected part.
- Try a different USB header/port if available.
- If possible, try a different cable.
- Microsoft Q&A guidance for this error specifically notes that an unknown USB error often points to the USB port or cable.
Reinstall the unknown Bluetooth/USB device.
- Open Device Manager.
- Under USB controllers, right-click the Unknown USB Device (Device Descriptor Request Failed) entry.
- Select Uninstall device and confirm.
- Shut down the PC, wait a few seconds, then turn it back on.
- Windows will try to reinstall the device.
- If it does not reinstall automatically, in Device Manager select Action > Scan for hardware changes.
Update the Bluetooth driver.
- Open Device Manager.
- If a Bluetooth adapter appears under Bluetooth or Other devices, right-click it.
- Select Update driver > Search automatically for updated driver software.
- If Windows does not find one, download the latest Bluetooth driver from the PC or device manufacturer website and install it manually.
- Restart after installation.
If the driver package was downloaded manually:
- If it is an .exe, run it.
- If it contains .inf and .sys files, use Device Manager > device > Update driver > Browse my computer for driver software, then point to the folder.
Check whether Bluetooth becomes available in Windows.
- In Windows 11: Start > Settings > Bluetooth & devices and confirm Bluetooth appears.
- Also make sure Airplane mode is off.
If Bluetooth appears but pairing still fails:
- Turn Bluetooth off and back on.
- Remove the Bluetooth device and add it again.
- Keep the device in range and away from nearby USB 3.0 devices, because unshielded USB 3.0 devices can interfere with Bluetooth.

If the device still stays as Unknown USB Device (Device Descriptor Request Failed) after trying another USB connection/cable, uninstalling/reinstalling, and installing the correct Bluetooth driver, the remaining likely cause from the provided guidance is a hardware-side problem with the USB connection path or the device not identifying itself correctly.