I am new with arduino and hardwares at all and I am having some problems in a project where I want to assemble the head tracker device from this project https://git.iem.at/DIY/MrHeadTracker/wikis/mrht-bno055 ... They use an Arduino pro mini for data processing (with a .ino sketch provided by them), an Arduino USB 2 Serial micro for connecting the pro mino to the pc, and a sensor BNO055 by Adafruit which provides orientation data. I am using the same hardwares instead of the USB converter that in my case is the ft232rl by FTDI. The step I am having problem is the one where I have to flash the HIDUINO firmware (they provide an .hex file) so I can use the whole thing as a MIDI device.
The point is that I just don't understand if I have to overwrite the pro mini's serial firmware or the usb converter's and how it's the correct way to do it, mainly because I can't find examples with the usb converter I have and every new reference I read makes me think of one possibility. In the first link they suggest reading the information in https://github.com/ddiakopoulos/hiduino/wiki which presents 2 methods: DFU method, that tells I need Atmel Flip software for Windows and ISP method, that I don't know if is my case because I can't find out if my ftdi board is an ISP programmer. I've read about it and in other references also, but I am still not sure about what I have to do. I hope that someone can help! And sorry for the basic doubts... Thanks!