These sites will tell you the hardware's origin, allowing you to go directly to the manufacturer's official support page for the correct driver.
Many users report that even with the correct 2.1.39.0 driver, the uPD720200 chipset is capped around 100-150MB/s, failing to reach true 5Gbps speeds. This is often a limitation of the older chipset's interaction with modern PCI-e lanes rather than a software issue. 3. Update the Firmware
During installation, macOS may prompt you to allow a system extension. Go back to Privacy & Security and click Allow next to the driver developer's name.
Run the installer as an . If you are on Windows 10 or 11, you may need to temporarily disable "Driver Signature Enforcement" if you are using a beta or specialized version of the XH-39.0 firmware. Step 4: Verification
The "39.0" designation typically refers to the major architecture version, optimized for modern 64-bit environments and improved power management. Why Driver Maintenance Matters
However, unlike mainstream drivers (e.g., NVIDIA or Realtek HD Audio), the XH-39.0 driver is frequently a used by Windows Update or third-party driver tools when the exact hardware ID cannot be resolved. It is also sometimes associated with:
Indirectly, yes. USB peripherals (gaming mouse, keyboard, controller, external SSD) rely on the XHCI driver for low latency. An outdated driver can increase input lag by 5–15ms. Always keep it updated for competitive gaming.
Efficiency tweaks that reduce CPU overhead during data transfers. Conclusion
Locate setup.exe or XH39_Install.exe . Right-click it and select Run as administrator .