hello I too have the same problem and is the
https://bitmaintech.com/ home scam to me then because I bought a new antminer S5 I wanted to give a refund and demand the shipment of parts (that I must disassemble) and then void the warranty.
how often they give away cards defective?
the boards should not be covered otherwise go to do damage to other users
thieves are well organized mafia
I do not recommend purchasing the bins are bitman
when they get home
the antminer s5 are defective and bitmantech is a den of crooks who sell broken material
Avoid the Chinese are unreliable and do not reimburse anything, you risk losing all your money like me
heading away from the Chinese and their poor quality stuff available for any clarification