Welcome to the HP Support Forums! It is a great place to find the help you need, from other users, HP experts and other support personnel. I understand that you are trying to install a BIOS for ROM family 2B35. I am happy to help with this.
Checking the available software for Windows 8.1, there are three BIOS downloads available, two of which are for ROM family 2B35. Versions 80.06 Rev.A and A0.05 Rev.A.
Which version are you trying to install?
Note that there is also a BIOS for ROM family 2B2C.
Are you using the HP Support Assistant to find the correct BIOS for you? If not, give it a try.
Let me know the answers to my questions and if this does resolve your issue, please mark this post as a solution.
Malygris1 I work on behalf of HP Please click Accept as Solution if you feel my post solved your issue, it will help others find the solution. Click Kudos Thumbs Up on the right to say “Thanks” for helping!