1. Prepare the software for serial port communication
   
   Download ExtraPuTTY utility from the official wesite, install and configure it. Consult with howto if troubles.
   
   
2. Uploading the firmware via xmodem
   
   Select File Transfer -> Xmodem -> Send in the program main menu to start upload:
   
   
   
   Wait for transfer to finish:
   
   
   
   
3. Uploading the firmware via ymodem
   
   Select File Transfer -> Ymodem -> Send in the program main menu to start upload.
   
   Wait for transfer to finish.