No sound on VEGA G2


Dear all,

I just bought a VEGA G2 for my dealer. it was their demo version.
When I try to play music (Qobuz streaming, USB DAC or through toslink for TV), I have no sound through my power amp or headphone neither.
The G2 was previously activated by a guy at the reseller, so I cannot activate it. They are working on it but it is why I have no sound. The G2 is blocked because of this activation?
Indeed my Mac can see the G2, I can try to start qobuz (I even see the picture of the album) but the song doesn’t start.
Thank you for your help