Create a batch file that disables bitlocker and installs the BIOS update
manage-bde.exe -protectors -disable c:
biosupdate.exe -NOPAUSE
Create a Configuration Manager application and make it a script installer
The batch file you created will be the installation program.
Detection method will be
Key:
HKLM\HARDWARE\DESCRIPTION\System\BIOS\
Value: BIOSVersion
Data Type: String
Click This registry setting must satisfy the following rule to indicate the presence of the application
Operator: Equals
Value: BIOS Rivision number
Since the BIOS update will automatically reboot, it is recommended that it is run in a maintenance window. Doing so during the day will be disruptive to workflow.