Windows repair options don't touch the BIOS. Typical BIOS upgrade utils include the ability to save off the current BIOS to a file or to an external device (diskette, USB). I'm guessing you did NOT do that or you would not be asking how to get it back.
Some systems have dual-BIOS feature which will allow you to select the other BIOS. You would have to check your computer documentation to see if you have that.
Otherwise, the only option is to download the older BIOS and flash that.