Serge, I have same error message on Explorer 2. My serial number is 21. Is yours early too?

Thanks Bruce

MC 200 Simaudio MOON P8W7 MOON 750D DAC Explorer2 MQA DAC Linn LP12 Transfiguration Proteus Magnum Dynalab FM tuner MacBook Pro, Sonore Ultra Rendu >Audirvana streaming Qobuz and Tidal Martin Logan Spire electrostatics Stax 009 headphones Velodyne DD12+ subwoofer