WARNING:
The COM port number assigned by Windows to AVR-ISP500
must be COM4 or below. Otherwise AvrStudio might not be able to detect
the programmer. Here are the steps to change it:
1. Go to Device Manager.
2. Unfold “Ports (COM&LPT)” and right-click on “Olimex Virtual COM -
AVR-ISP500 (COMxx)” where COMxx can be anything between
COM1 and COM255. Select properties.