Where is the serial number on my ONE? Chris May 10, 2021 18:21 Updated The serial number for ONE can be found on the backside of the unit or on the box. Related articles System Extension Blocked alert during software installation Where is the serial number on my Duet? How do I reset the ONE for iPad & Mac? It says “No Apogee Systems Found” in Apogee Maestro or Control software and my interface is not recognized Guide for Getting Started with Apogee Gear Comments 0 comments Article is closed for comments.