DriverCove

B420-SR Unified Wire Ethernet Controller Driver 4.3.8.1

by ChelsioWindows 11Windows 1064-bitSHA-256 verified

Manufacturer
Chelsio
Device
B420-SR Unified Wire Ethernet Controller
Driver version
4.3.8.1
Release date
February 14, 2013
Supported Windows
Windows 11, Windows 10
Architecture
64-bit (x64)
File size
4.1 MB
File name
20543580_62f7b119a125c7cd6ffa4efc069d4a13d8ac6e34.cab
Digital signature
Signed - catalog ChT4Ndis.cat
INF version
02/14/2013,4.3.8.1
INF provider
Chelsio
Device class
Net
Source
Microsoft Update Catalog
Last verified
July 8, 2026
SHA-256
d1c971048444f7a38db14b29de9c6e7718dc2186fee1bb96943171d3679489a5

Supported hardware IDs (3)

Compare with your device: Device Manager → right-click the device → Properties → Details → Hardware Ids. If one of the values above matches, this driver supports your hardware.

How to install

  1. Create a restore point(Start → "Create a restore point" → Create), so you can roll back if anything goes wrong.
  2. Verify compatibility: your Windows version (Windows 11, Windows 10) and architecture (x64)must match this driver, and your device's Hardware ID should appear in the list above.
  3. Download the file using the button - it comes directly from Microsoft Update Catalog.
  4. Optionally verify the checksum: open PowerShell, run Get-FileHash your-download.cab -Algorithm SHA256 and compare with the SHA-256 above.
  5. Extract the .cab archive: right-click → Extract All, or run expand -F:* file.cab C:\driver\ in Command Prompt.
  6. Install via Device Manager: right-click your device → Update driver → Browse my computer → point to the extracted folder. Alternatively run pnputil /add-driver C:\driver\*.inf /install.
  7. Check Device Manager: the device should show no warning icons, and the driver version should match.

How to roll back

If the device stops working after the update: Device Manager → right-click the device → Properties → Driver tab → Roll Back Driver. If the button is greyed out, use the restore point from step 1 (Start → "Recovery" → Open System Restore).