thanks for confirming Arc, at least now I know for sure I'm at the beginning again.

I tested one setting in the bios which Asus claims should increase compatibility for the rams.
well it didn't work for me, I'm going to share the result with them.
it seems that I'll either stick to 2133MHz or try another memory brand and go on troubleshooting.

you are a great help as always, I can't thank you enough.