This small and affordable adapter is incredibly useful for many scenarios:
Because these are generic devices, Windows doesn't always have the driver pre-installed. If your adapter isn't connecting, you likely need the sr9900.inf driver file.
Even with the right driver, you may run into a few known quirks.
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Here’s a technical write-up for the USB device with and PID 0x9900 .
Modern operating systems handle common chipsets automatically, but the RD9700/SR9700 series frequently requires manual driver intervention on newer platforms. 1. Windows 10 and Windows 11 (Automatic Update) Plug the USB adapter into your computer. Open (Right-click Start > Device Manager).
Uncheck the box that says . Click OK and restart your computer. 2. Switch USB Ports This small and affordable adapter is incredibly useful
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Essentially, this device is a cheap, compact USB-to-Ethernet (RJ45) dongle designed to provide wired internet access to laptops, tablets, or desktop computers lacking an internal Ethernet port. Technical Specifications & Performance Expectations
Network configuration conflicts can prevent a properly installed adapter from pulling an IP address. This public link is valid for 7 days
If rolling out Windows 11 to devices with this chip, pre-stage the ASIX driver via SCCM or MDT. The Microsoft Update Catalog does not list this vendor ID natively, so you must inject the driver into your golden image.
The driver is not loaded, or a generic driver is failing.
driver modules, though some users report it requires manual mode-switching to function correctly. Common Uses & Troubleshooting It is frequently found in "USB to RJ45" dongles. "Fake" Storage Issue:
💡 If you see "No Connection" even with drivers installed, check if the MAC address is being reported as all zeros ( 00:00:00:00:00:00 ). This is a common firmware bug in cheap clones. Configuring a static IP for this adapter? Fixing the "USB device not recognized" error?