upgrade firmware v1.39 kc868-h32bs

[mutaz]

hi

i have kc868-h32bs v1.39 . 
i'm trying to upgrade the firmware . 
i downloaded KC868 Controller Bootloader and used serial to usb cable to upgrade but every time i run it i get error 
is there a way to upgrade using ethernet? if not what's the solution

[admin]

1. Connect with USB-RS232 cable. 
2. check COM port in your windows OS "Device manager"
3. fill COM port to bootloader tool.
   

[mutaz]

1. Connect with USB-RS232 cable. 
2. check COM port in your windows OS "Device manager"
3. fill COM port to bootloader tool.

i checked and updated but still same error. see image

[admin]

maybe your port is occupied. you can reboot of your computer for a test. if also have problem, you can try to use another computer.