How to Fix the Unknown Device Error (Code 43) in Device Manager

After reinstalling any operating system, it is necessary to install drivers to ensure stable and uninterrupted operation of the hardware. However, sometimes installing these utilities doesn’t yield the desired result, and users see an error message stating that the hardware cannot be installed due to a malfunction (Code 43). In this article, we’ll discuss what an “Unknown Device” is and how to resolve this issue.

An “Unknown Device” refers to hardware connected to a PC with missing or corrupted drivers (e.g., a video adapter, network card, or other equipment). While the device might function, it may do so with reduced speed and stability.

Many ignore this problem, but if it involves a graphics card, you won’t be able to play modern games. Similarly, if it affects the Wi-Fi module, wireless internet will remain out of reach.

This is why it’s essential to identify the connected device and resolve the issue.

When Does the Unknown Device Error Occur?

This problem can arise in various situations, such as:

Incompatibility between the drivers and the OS version.
The presence of viruses.
Incorrect BIOS settings.
Errors in the driver files.
Physical damage to the hardware (e.g., ports, cables, or connectors).

The error message “USB\UNKNOWN,” “USB\VID_0000&PID_0000,” or “USB\VID_0000&PID_0000&REV_0000” indicates that Windows could not read the device ID. Possible reasons include:

Device malfunction.
Signal loss due to a faulty or overly long USB cable.
Insufficient power on the USB bus.

Solutions to the Issue

Here are some methods to resolve the “Code 43” error, with an 80% chance of success.

1. Driver Installation

If the drivers from the OS installation package do not work after reinstalling the system:

Open “Device Manager,” locate the problematic device, open its properties, and click “Uninstall.” This removes any potentially faulty files.
Download and install the correct driver, ensuring it’s the latest version.
Restart your computer.

2. Driver Rollback

If the OS hasn’t been reinstalled and the error didn’t occur previously, try rolling back the driver:

In “Device Manager,” find the problematic device, open its properties, and click “Roll Back Driver.”

If this doesn’t work, uninstall the driver entirely and follow the steps in the previous method.

3. Scan for Malware

Certain viruses delete system files, including drivers. “Unknown Device” might be a minor consequence of such malware.

Use tools like Dr.Web CureIT or AdwCleaner to scan your computer.
Restart the computer after the scan.

4. Update System Files

To avoid conflicts between drivers and the OS version, ensure that “Windows Update” is enabled and functioning. Regular updates help prevent driver-related issues.

5. Use a Powered USB Hub

If the error occurs with USB devices, consider purchasing a powered USB hub. Some modern devices require more power than older PCs or laptops can provide.

6. Clean the System

System clutter and invalid registry keys can cause hardware issues.

Use CCleaner to clean up the system and registry.
Restart the computer afterward.

7. Hardware Inspection

Inspect and replace faulty cables, connectors, or ports. Dust buildup in USB ports or on the motherboard can also cause problems, especially in harsh environments like warehouses.

8. BIOS Configuration

Occasionally, “Code 43” results from incorrect BIOS settings or outdated firmware. Some motherboard ports may be disabled by default. Fixing these settings or updating the BIOS may resolve the issue.

Conclusion

This article should provide you with a clear understanding of the “Unknown Device” error and how to fix it. Regularly updating drivers, system files, and antivirus software minimizes the likelihood of encountering this issue.

If none of these solutions work, consult a service center or an experienced technician. It’s possible that the problem lies elsewhere, or you might need professional assistance to resolve it.

In any case, “Unknown Device” is not a critical error—it can usually be fixed with minimal time and effort.