When encountering the problem of "USB device not recognized", first confirm the physical connection and device status, try to re-plug or unplug or replace the data cable and USB disk; then disable or uninstall the USB controller driver through the device manager and re-enable it; then manually update or roll back the driver; finally try to clear the USB cache information in the registry and restart the computer. If it still cannot be resolved, it may be hardware corruption.

It is really annoying to encounter the problem of "the USB device is not recognized" on Windows, especially when you are in a hurry to copy files or debug the device. This problem does not necessarily mean that the hardware is broken, but is often a system, driver or connection problem. Don't rush to change the USB port or restart the computer, take a look at the following directions.

Check the physical connection and the device itself

Sometimes this problem is not the computer's pot at all, but the cable is not plugged in properly, the interface is loose, or there is a problem with the device itself. Try these first:

• Unplug the USB cable and plug it in again to confirm whether there is any bad contact
• Try changing a cable or a USB flash drive (some cheap data cables only charge and do not transmit data)
• Plug it into another computer to test whether the device works normally

If you are using a USB HUB or extension cord, it may also be because it is powered or has poor compatibility. It is more reliable to directly plug in the USB port on the motherboard.

Restart the USB controller in the Device Manager

There is a "universal plug-and-play controller" or "USB controller" in the Windows Device Manager. Sometimes these drivers fail to identify the device. You can do this:

1. Press Win X → Select "Device Manager"
2. Expand Universal Plug and Play Controller or USB Controller
3. Right-click each item → "Disable Devices", wait a few seconds before "Enable"

You can also right-click → "Uninstall Device", then unplug the USB and plug it in again, and the system will automatically reinstall the driver.

If you see a yellow exclamation mark or question mark, it is basically a driving problem.

Update or rollback the driver

Sometimes after the system is updated, the driver may become incompatible, and this prompt will also appear. You can try to manually update the driver:

• Find your USB device in Device Manager (may appear as "Unknown USB device")
• Right-click → “Update Driver” → “Auto Search and Update”

If the driver has been updated recently, it can also be selected as "Properties" → "Driver" tab → "Rolling back driver".

Clear USB cache (registration form)

Windows sometimes caches old device information, causing conflicts. This situation requires cleaning in the registry:

?? It is recommended to back up the registry before operation!

1. Press Win R to enter regedit
2. Positioning path:計(jì)算機(jī)\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\USB
3. Delete all the subitems inside (or only delete the part of the problem device)
4. Then restart the computer and re-insert the USB

This step is a little risky, but it is more effective for recurring identification problems.

Basically these are the methods. Most of the time it can be done by checking the hardware connection, refreshing the driver, or clearing the cache. If you try all the methods but don't work, it may be that the motherboard USB controller is broken, or the device itself is damaged.

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