If you believe the item was defective, you can return the miner to the following address immediately without obtaining the prior authorization, however, if the device is not under warranty or turned out to be a mis-diagnosed unit, there will be a return shipping fee and diagnostic fee be billed to you before the package be send out...

Bitmain Warranty
3700 Quebec Street #100239
Denver, Colorado 80207
USA

Telephone: +1-844-248-6246

Average Turn Around Time for non-preauthorized RMA, be 2-3 business days before it is send out.

Required printed Bitmaintech.com order confirmation page and brief description of what is wrong with the unit. (Please make sure to include a phone number and e-mail address, so one of the techs can reach you if they have questions)

* WARRANTY IS EXCHANGE TO A FUNCTIONING ITEM ONLY.  THERE WILL BE NO REFUND.