Hi,
 
We understand your concern regarding your miner not performing as well as others, however as your hash rate is higher than 400GH/s we cannot issue a RMA. We are continuously working on the firmware to improve performance and stability.
 
If you have any further questions or issues please do not hesitate in contacting us.  
 
Best regards  | Med vänlig hälsning  
Keith Gurnett  
Kncminer
www.kncminer.com
Office: +46 8559 253 20