Same here I would like to update firmware on the drives.
I have 2xMP600 1Tb in RAID0 on MSI X570 board.
Could this work, haven't tested, but got this idea:
1. Install Windows 10 on a seperate drive or use another computer
2. Configure Raid Off in bios
3. Update firmware on both single disks (Hopefully data or raid config is not impacted)
4. Configure Raid mode back on in BIOS
Could this work, anyone tested?