First of all, just to make sure the device has been detected correctly, plug in a USB cable and check the device manager to see if the operating system detects the USB-serial chip. On Windows, go to device manager and it should appear as a USB-serial port (CH340G, with a port name like COM?? where ?? is the assigned serial port number). On Mac, you can go to System Information and under ‘USB’ it should list this as a serial device (again, the chip name is CH340G). You can also do ‘ls /dev/tty.wch*’ in command line to see if anything shows up.
Next, from the screenshot it does look like the firmware has been flashed (albeit the verification error). Does the controller boot up correctly? If it doesn’t boot up, that means some error occurred during flashing. If you try to flash again, does it produce the same error?