Tamron 50-400mm f/4.5-6.3 Di III VC VXD Lens firmware update version 3 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 3 incorporates the following fixes and enhancements:
Get the Tamron 50-400mm f/4.5-6.3 Di III VC VXD Lens at B&H.