About TMDSEMU560V2STM-U: A total of 6pcs of this product was ordered on June 28 , but when I went to use them after receiving the goods, I found that 4pcs products can be used directly, and 2pcs products can not be used normally without any reaction. Please confirm that the 2pcs product is a factory quality problem, or can you give technical instructions to see if them can be used normally? thank you. ( The four order No. T01518740 /T01517658 /T01729377 /T01752589 are OK; But The two order No T01517671 and T01518737 are faulty.)