steel legend b550m

Hello, i need helop to manage how to raid0 my two nvme with B550m Steel Legend. 1 - My Bios Version is 2.00, but i already checked with 2.20 and 2.30 w/o any changes in options which will be described here. 2 - Actually i have ONLY storage both m2 nvme one with 512gb and another one with 1tb...