Hi there !
@Ian444 : thanks, yes I’ve seen it. I don’t really know how to use it, I’m not under Mac OS.
@silver13 : If I understood well, you suggested me to use the boldclash’s makefile. I tried it and the only change is that after flashing, instead of the 5 blinks, it is now some funky blinking that I don’t know how to describe !
So I tried on an other computer, reinstalling the tools and git stuff… and same. As tetramonium (who posted on rcgroup about flashing under linux) made it on an older version than mine, it seems that mine (ubuntu 18.04.1) is not able to compile the same way that ubuntu 16.04 did.
So the way I made it to work is to set an ubuntu 16.04 liveusb and use it to flash the board. and that works great !!
Thank you Silver13 and others for your support until now.