You cannot download a standalone firmware file. Instead, you must download the management software that automatically fetches and installs the correct firmware for your specific model:
If a new version is available, a red notification badge or an "Update" button will appear in the "Overview" tab. plantronics voyager focus uc firmware download
Download Poly Lens Desktop (Recommended for Windows and macOS). You cannot download a standalone firmware file
Look for "Voyager Focus UC" in the left-hand sidebar. plantronics voyager focus uc firmware download