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isaacc: Thank you very much for joining the Intel® Rapid Storage Technology communities.
In regard to your inquiry, I just wanted to let you know that the metadata of the RAID is saved on the hard drives, it is not save on the CMOS. So, a work around that you can try will be to disconnect the hard drives, do the BIOS update, immediately after that get in the BIOS and change the SATA mode to RAID, once you do that, then you can connect the hard drives again and the RAID 0 should work just fine.
Any further questions, please let me know.