There should be no need to change this setting. As an end-user please contact your reseller or post your question in the Snom Forum for further details in this regard. As a VAR please ask snom support via a ticket.
Status → System Information → System Information → Hardware Version
Settings → Information → System Info → Hardware Version:
This setting cannot be provisioned !!!
System internal parameter. Contains the hardware version number, to support differentiating several hardware revisions in regard of deskphone firmware release compatibility.
Note: Its value, beside mentioned above PUI/WUI details, is also reported inside a custom X-snom-" custom HTTP header.
0 (for superseded HW-Revisions) , >=1 (for new HW-Rev.)