From the beacon detail Settings view, tap on the Actions menu and select the Reset action. When prompted, submit a valid PIN to execute the Reset action and revert all of the beacon configuration settings to factory default, including the PIN value.
Note: For beacons that support eight (8) digit PINs, the factory default PIN is '00000000'. For beacons that support four (4) digit PINs, the factory default PIN is '0000'.