To reset a AT-UHD-PRO3 matrix, you can use one of three methods (firmware version 13 or later):
Connect to the matrix using either RS232 or Telnet and send the following command:
"Mreset" followed by a carriage return (no quotations)
With access to the web interface of a AT-UHD-PRO3 matrix, access the "Control" tab of the web-gui. Then click the "Reset Now" button under Factory Default.
Article ID: KB01077