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 it can be used normally? thank you.
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