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DLPC6401: DPP6401贴片后无法识别驱动,无法烧录程序

Part Number: DLPC6401

请问,我这里有一块dpp6401的板子,之前是经过验证的,老的PCB(大约是几年前)可以正常的识别然后烧录程序,然后我现在重新打样了几块,但是发现无法识别驱动,无法烧录程序,请问有可能是什么原因?