PCI\VEN_1B21&DEV_2425
Thunderbolt driver
PCI\VEN_1B21&DEV_2425 is the ASMedia Technology Inc. ASM4242 USB 4 / Thunderbolt 3 Host Router, a Thunderbolt device. Windows 11 includes support for most Thunderbolt and USB4 controllers; older systems need the maker's Thunderbolt software. Get it from Windows Update or your PC maker first; the chip maker's own package is on intel.com.
Device details
| Hardware ID | PCI\VEN_1B21&DEV_2425 |
|---|---|
| Device name | ASM4242 USB 4 / Thunderbolt 3 Host Router |
| Maker | ASMedia Technology Inc. (PCI vendor ID 1B21) |
| Device type | Thunderbolt |
| Driver guide | Get the Thunderbolt driver |
How to install the driver for ASM4242 USB 4 / Thunderbolt 3 Host Router
- Confirm the ID. In Device Manager, right-click the device, open Properties, then Details, and pick Hardware Ids. The first line should start with
PCI\VEN_1B21&DEV_2425. - Try Windows Update. Settings, Windows Update, Advanced options, Optional updates. Thunderbolt firmware and drivers sometimes arrive here.
- Check your PC maker. Enter your model or serial number on its support site and look under Thunderbolt or Chipset.
- Use the chip maker's package. Why Are There No Thunderbolt Drivers for Intel NUC Using Windows 11 on intel.com. Our get the thunderbolt driver guide explains which package fits.
- Restart and check. Connect a Thunderbolt or USB4 device and check that it works.
Other ASMedia thunderbolt IDs
Device names: The PCI ID Repository, public data. We never host driver files: downloads come from the maker.