The first step is to identify which Corechip controller your adapter uses. This ensures you download the correct driver. Follow these steps:

While Windows 11's stringent security features like Driver Signature Enforcement and Memory Integrity can cause friction with older CoreChip drivers, the disabling steps outlined here offer a functional solution. As more manufacturers produce adapters with the , which enjoys native Windows 11 support, the future of CoreChip on Microsoft's latest OS looks reliable. For users with legacy RD9700 chips, the experience remains viable, albeit with minor troubleshooting effort. Ultimately, having access to a stable wired connection via a functional CoreChip driver ensures your device remains connected and productive in any environment.

: After downloading, run the installer and follow the on-screen instructions to install the driver. You may need to restart your computer to complete the installation.

Before installing a driver, you must verify the exact hardware ID. "Corechip" controllers are heavily repackaged by third-party white-label brands. Right-click the and select Device Manager .

The most common chipsets include:

Have a specific error code? Drop the code in the comments (or consult your IT admin) – the Corechip driver is finicky, but we’ve seen it all.

Expand the section (or check under Other devices if it is unrecognized). Right-click the problem device and choose Properties . Navigate to the Details tab. Select Hardware Ids from the Property dropdown menu.

Right-click your USB Ethernet adapter and select . Go to the Details tab. Click the property dropdown and select Hardware IDs . Look for the VID (Vendor ID) and PID (Product ID). RD9700 Corechip ID: Typically shows VID_0FE6&PID_9700 . SR9900 Corechip ID: Typically shows VID_0FE6&PID_9900 . Step 2: Download the Official Driver

For Windows 11, the built-in Microsoft driver is the “top” choice for most users. Only download the CoreChip-specific SR9900 driver if you have speed or connection problems.

The and SR9900A are the most common chips in 100Mbps USB Ethernet adapters produced in recent years. This chip is a high-integration USB 2.0 to 10/100M Fast Ethernet controller. If you purchased a simple plastic adapter with an RJ45 port and a USB-A or USB-C connector within the last five years, there is a high probability it runs on an SR9900 chipset.

Click and navigate to the folder where you extracted the downloaded driver (look for the .inf file, such as rd9700.inf ). Follow the prompts to finish the installation. Troubleshooting and Performance Tips

This is a power management bug in Windows 11.

: For a digitally signed version, search the Microsoft Update Catalog for "Corechip." Look for drivers with a version date of 2019 or newer for the best compatibility.