The only other suggestion I can recommend is for you to back up any files you don't want to lose, and then run the recovery manager to do a system recovery to the notebook's out of the box condition, or use the recovery disks to do that.
The BIOS revision will not be reset and will remain at the latest update.
Please read the link below for your recovery options.
http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&docname=c00006110