hi, dogie is the right person to help u with the operation guide and technical support.
please understand that sometimes customers may come across problems with your miners due to various combinations. And it did happen before we received the so-called faulty items or even the whole unit and found it was actually running well.
And if you found some hardware problems, like the faulty hashing PCBs, controller boards,etc, you can send an email with your RMA request to this email address: info@bitmaintech.com or contact Bitcoinwarranty directly. We will arrange a return accordingly.
Anyway, we will try to improve our aftersales service.