Hi Himanshu
I am Dave, an Independent Advisor, I will help you with this.
Start your laptop, then on the HP logo screen, repeatedly press the Esc key or Fn + the Esc key
On the resulting menu, you should be able to access BIOS on that laptop by pressing F10 or Fn + F10.
If you still cannot access BIOS, what error (if any) are you seeing?