help!! did a BIOS update on my laptop, and afterwards Windows wouldnt boot.

Your PC ran into a problem and needs to restart. We're
just collecting some error info, and then we'll restart for
you.
42% complete
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If you call a support person, give them this info:
Stop code: IRQL_NOT_LESS_OR_EQUAL
Turns out the update reset teh storage mode. Windows was installed in RAID/RST mode and now its AHCI. Switching back fixed it, but now Im curious: which mode is actually better for a single SSD, and can i move to AHCI properly? Id also like to understand why a single BIOS opiton can stop Windows from booting at all. im about to throw this thing out the window lol