Using ratOS with a mellow super8 v1

Hello helpers,

I have mostly finished my vcore3, at least regarding the assembly and electronics.
Now the hard part (for me) : software and firmware.

I have installed a firmware on my super8, following the mellow instructions, to make it klipper ready.

Obviously the super8 isn't listed in the preconfigured boards, but I saw in the discord that several users could run ratos with it, and also that ratOS latest versions were able to accept those kind of unlisted boards.

All components are up to date in ratOS, but I am stuck at the flashing steps. And honestly this is way beyond my knowledge.

Anyway someone can help me ?

Or maybe it's totally impossible and then I'll have to stick with standard klipper, but then I guess I'll have to import all the macros ? Especially the one related to the 3points bed kinematics.

Thanks ,
Articho