Tamron 20-40mm f/2.8 Di III VXD Lens firmware update version 2 is available via Tamron Lens Utility app (free) on a laptop or mobile device (using the mobile app version) connected via the lens's USB Type-C port.
Firmware Version 2 incorporates the following fixes and enhancements:
Get the Tamron 20-40mm f/2.8 Di III VXD Lens at B&H.