The following update is available for Surface Go 3 devices running Windows 10 October 2020 Update, Version 20H2, or greater.
This update enables support for the new system configuration.
Windows Update Name Device Manager Surface - Firmware - 3.1.1.12 Surface ISH – Firmware
Source:
Surface Go 3 update history - Microsoft Support
List of updates for Surface Go 3.
support.microsoft.com
Manual download:
Download Surface Go 3 Drivers and Firmware. from Official Microsoft Download Center
All current firmware and drivers for the Surface Go 3
www.microsoft.com