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 How do I reset the ONE for iPad & Mac? Where is the serial number on my Duet? Is ONE compatible with Mac OS X Mountain Lion? System Extension Blocked alert during software installation Maestro is not recognizing my Apogee device on my M1 Apple Silicon Mac computer Comments 0 comments Article is closed for comments.