After the Update and the recommended CMOS Clear that should be done after the BIOS Flash (PSU should be disconnected from A/C power for the CMOS Clear), all BIOS Settings will be lost and need to be reconfigured. As "RAID" is usually not the default operating mode of the board's controller, it needs to be manually set to RAID Mode in BIOS after the update procedure. After that, the Array usually functions normally again.
However, it is highly recommended to backup all important data before the BIOS Flash, just to be on the safe side.
In any case, don't update the BIOS unless it is absolutely necessary.