HP spare part: USB board, For use in models with WLAN. Unverified source; not bench-tested.
Source notes
Manual on file for HP Elite c640 14 inch G3 Chromebook Maintenance and Service Guide, PDF page 19: "For use in models with WLAN N13679-001". Source link not recorded and not verified as an HP document (red, not sure). (via v10 fold 2026-11-12)