I have written much code for my blue pill but suddenly serial.print is not working on pin A9
I finally found I had to change it to serial1.print and all works OK
Did I download a new library or something
@jpsr, your topic has been moved to a more suitable location on the forum. Your question has nothing to do with Avrdude, stk500 or Bootloader.
Did you? How would we know what you downloaded?
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