Does it matter if I'm running IRST?
-BGM
It is very possible that when you update your bios, it resets to default settings and sata raid isn't typically the default setting. to be on the safe side, I probably call MSI and ask them if updating bios affect any raid settings.
The Z370 chipset supports sata raid. Updating the bios shouldn't affect the usability of it, unless as mentioned above, settings get reset to default. It would be very crappy move on the vendors part if they wiped out raid pertinent settings.
I can already see this from a mobo vender.. oh hey.. urgent update your bios to mitigate intel's latest cpu vulnerabilities.. oh btw your will lose all your raid configs. :o