We sell brand new original KS3M control boards. KS3M control boards can only be used with Iceriver KS3M miner models. They are often used to replace faulty, non-working KS3M control boards. The customer will bear any losses incurred due to mixing and matching. The quality of the control boards we sell is guaranteed. If you have any questions after receiving the goods, please get in touch with us in time to help you quickly solve the miner operation problems.