avrdude: ser_open(): can't open device "\.\COM4": Access is denied.
That is not the whole error message and you neglected to mention a few things that might help get you a solution.
Could you read this post please and add any additional details.
avrdude: ser_open(): can't open device "\.\COM4": Access is denied.
That is not the whole error message and you neglected to mention a few things that might help get you a solution.
Could you read this post please and add any additional details.