As I understand it they became aware at some point that some were affected, but whilst they knew the component that had an issue, they didn't have that correlated with serial numbers of completed units. They then achieved that by embedding an identifier within the Firmware release. Wishing you speedy resolution for your situation...

Patience is not easy in this whole MQA saga but I do feel more at ease after their very positive response to me to day. Hoping for the same for you and others so affected.

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