Hi, I haven't previously had this issue. The error is coming up on a new revision of a board that previously worked fine. The changes in revision has no effect on the connections to the MCU as it was changing the interface connector from USB mini b to USB C. I have confirmed my PC communicates with the on PCB FTDI and the MCU communicates via the target configuration 'Test Connection' feature. The JTAG connections have been made the same as the TMDSCNCD28388D development board. I have only made 1 of this revision to check if it works before producing multiple for product testing. It is a freshly made PCB with no program flashed on it. Thanks, Mike
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