If defective on arrival, the client will get a whole refund instantly and no return on the miner is required. ?? ??? ??????? ????? ??? ? ???‌?????? ?????? ????? ???? ??????? ?????? ??????? ?? ????? ?? ????? ??‌??? ???? ????? ???? ??? ???. ???? ???? ??? ?????? ???? ????? ???? ????? ??