Home › Forums › Products › Stompboxes › 2 H9s with Invalid Serial Number › Reply To: 2 H9s with Invalid Serial Number October 16, 2021 at 1:19 pm #159493 joecozziModeratorEventide Staff Are you sure the previous owner deregistered the units? It is possible to customize the PIN #’s of the H9s, but you can verify the actual serial # by going into the System Settings > Utilities > Serial No.
