Just in case I'm not the only one to be caught out by it, I'll draw attention to a far simpler cause of this "programmer is not responding" error:When the GUI says "RESET the board right before exporting", it means press reset and then export immediately. Do NOT wait on the board appearing to "come back to life" - by then the upload opportunity will have passed....
I also have 2 different boards with the exact same behavior, both connecting with different Serial Numbers.in the Tools menu board A I get: /dev/tty.usbserial-A1015S9 and /dev/cu.usbserial-A1015S9and board B gives me: /dev/tty.usbserial-A4000PCB and /dev/cu.usbserial-A4000PCB
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