I have a teensy 3.2 demo board, which can be used normally, but after I replaced the MK20 on the board with a new blank MK20, I can recognize the USB by pressing the programming button, and download the program through the software, prompting the download is complete. But the reboot failed. It seems that the program has not been downloaded successfully and cannot be used normally. What could cause such a problem?SJ1 in the schematic diagram has been welded together。
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