Ender 3 Pro v1.1.5 firmware update

Marlin Firmware Service Support
1

If I have a ender 3 pro marlin firmware hex file, what is the correct way to update the firmware on the v1.1.5 board? Is it simply adding the hex file to the sd card or via usb? If its via usb, what is the best way to do it?

Thanks in advance!

2

There is a demo video here for updating this board:

3

Thanks, but I worked it out already. The V1.1.5 board has the bootloader already installed. So it was a matter on how to update the firmware (hex) via usb from PC. Using avrdude worked for me.