Twin25G T5 Thunderbolt 5 Adapter
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Driver (0)
Firmware (2)
IDDownload TitleDownload LinkPost Date
1267 Sonnet Thunderbolt 5 Firmware Updater 2.1.69 [macOS] 2.1.69Oct-14-2026
1269 Sonnet Thunderbolt 5 Firmware Updater 2.1.69 [Windows] 2.1.69Oct-14-2026
Operating System Requirements: Windows 11
File Name: Sonnettech_Thunderbolt_Firmware_Update_Tool_2.1.69.zip
File Size: 4.1 MB
Thunderbolt Firmware updater for Windows. This release updates your Sonnet Thunderbolt 5 product’s firmware to version 64.1.69 to improve general reliability. This updater runs only under Windows; Mac users must use the macOS version of the updater.

Notes
• Before running the updater, you must disconnect all devices from your Windows host except for the Thunderbolt 5 device you’re updating.
• If you’re updating Dock, you must also disconnect all downstream devices connected to the dock; the firmware updater cannot launch unless all devices are disconnected from the dock.
• Before running the updater, “safely remove” (eject) any installed SSD.
 
 
Manual (1)
FAQ (3)
IDArticle TitlePost Date
1044 My 10G/25G adapter performance drops significantly on a laptop when battery level is low.Jun-19-26
1223 TWIN25G Teaming for Windows 11Aug-13-26
1226 TWIN25G macOS driver does not show in ExtensionsJun-01-26
The TWIN25G driver kit extension will not show in System Information>Software>Extensions.

To check whether the driver is installed, go to System Information>Hardware>Ethernet Cards. Click on one of the TWIN25G's ports and it should say Driver: com.sonnettech.sntmlx5e.