Cointerra is totally ignoring me for an RMA. They will not respond to my emails and conversations on Cointerra forum. DO NOT BUY FROM THEM if you expect good customer service they will not honer it. They're one of the most terrible company. Their machine isn't even stable, I leave it at the datacenter and CTA 0 always die during a 2-3 day hashing, so I have to drive 30 minute there every 3 days to power cycle it. I will never ever buy from cointerra again.