new problems...
thanks to Liriel I was able to setup everything to working state but...
I got a VERY weird situation, the SD mod works, I installed the hmods by putting them in a transfer directory, they work, custom borders, genesis, etc...
when I try playing Genesis games it sometime works but it'll most of the time give me C2/C3 and then C7 and then my SNES Classic will act up and crash. I didn't use anything fancy, same setup as I had directly on my console before SD. (no save compression or extra space hmods this time(no need)...
I use my SD in FAT32 since I wasn't able to use ext properly on my PC.
I'm using the following hmods:
_km_genesis_plus_gx_12_25_17.hmod
_km_mame2003_12_28_17.hmod
_km_retroarch_167_12_25_17.hmod
_km_snes9x_12_25_17.hmod
I'm seriously considering just reverting everything to normal and enjoy arround 200 games.