Dual V2 & I/O and Triple I/O Firmware update procedure under Windows PC

Windows PC USB Drivers and firmware uploader:

How to flash firmware on Windows PC

1. Download .hex file with firmware (Dual V2 firmwares, Triple I/O firmwares)
2. Download USB Drivers for Windows and install
   

3. Download and extract Xloader and run XLoader.exe

Select .hex file with firmware, Device Duemilanove/Nano(ATmega328old), Baud rate 57600, select COM port that will appear after connecting controller with USB, then hit Upload:

Upload process will take 10-20 seconds.

Done.

Reboot device by replugging power.