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I use Arduini Uno cards with ATmega 328P processor
I tested with different rates of 9,600 to 115,200, same message.
With the Arduino software, data transfer is the same at the rate of 115200 com17. and it works.
Pellen

Hello John, I have a problem to transfer the program to the Arduino board . I followed the instructions in the forum program configuration , with the address : $ ( appdir ) compilers \ April \ batchfiles \ avrc_arduinoA.bat and ligneparamètre : AVRDUDE $ ( chipalt ) STK500 COM17 115200 "$ ( target) ...