Flashing bricked many early units because users didn't read the pinouts. Follow this carefully.
Run a verification check. If AVRDUDE reports "0 errors," disconnect the programmer, reassemble the radio, and turn it on. ats20 firmware
firmware (typically version 1.1.5), you might find the interface a bit clunky or the tuning steps too rigid. Upgrading your firmware can transform this "toy" into a serious DXing tool. Why Upgrade? Flashing bricked many early units because users didn't
Click "Upload." The LEDs on the internal Arduino will blink rapidly. Once finished, the radio will reboot into the new interface. Pro-Tips for Success " disconnect the programmer