Not clear what the question is, but the answer is no. Removing a (software) raid array loses all data.
I believe you're referring to the fact that when you perform a BIOS update, the entire BIOS configuration is lost (including any overclocking and on-board RAIDs that you configured). The good news, however, is (typically) that you can simply re-configure the RAID as you had it before and your data will be there just as you last left it. However, that is assuming that the RAID BIOS specifically wasn't changed so much that it wouldn't be able to read its previous data layout on the array. Good luck.
What you must do after flashing the BIOS, is re-boot and during POST press <delete> to enter BIOS setup. Select "Load optimized defaults" and press enter to load them. This allows the system to detect all the peripherals.
Select "Save and Exit", then Y to save to CMOS, and exit BIOS.
DO NOT ALLOW WINDOWS TO LOAD!
Shut down and re-boot. Enter BIOS again during POST and re-set your drive controllers to ACHI or RAID as appropriate. Also make any other changes that you had before the new BIOS flash.
Now allow Windows to load and your RAID will be detected and the files will all be OK.
It is good practice to back up your data before starting the BIOS flash.