Here is what HP has to say:
"To check the current BIOS version on the computer, follow the steps below:
Click Start, Shut Down, Restart, and then click OK.
When the blue Hewlett-Packard screen appears, press F1 to enter the BIOS Setup.
The BIOS revision is listed on the Main menu. Make note of the current BIOS version; you will need this information to determine if a newer revision is available.
To exit the BIOS setup, press F10, select Yes, and then press ENTER."
I hope that this is helpful.