1)-No refund and return after the payment.
2)-The Miner Machine have 180days warranty
3)-If it is out of warranty, we will provide paid maintenance service
 
Warranty Invalid: 
1)-Customer removes/replaces any components by himself without receiving permission from Bitmain first
2)-Damage caused by poor power supply, lightning or voltage surges
3)-Burnt parts on hash boards or chips
4)-Miner/boards/components damage due to water immersion or corrosion due to wet environment