How do I replace my WLAN internal wireless adapter?
Remove the WLAN module by disconnecting two antenna cables from the module; remove one Phillips M2.0 x 2.5 screw securing the module to the computer and carefully take off the WLAN module itself. If you're installing a new module, be certain it is authorized for use as per regulations in your country or region; if issues arise after installation, contact technical support. Reverse this procedure when reinstalling if needed with caution (Page 32-34).
From the official HP Elitebook 850 G6 Notebook PC manual, page 32
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