Unable to enter BIOS

[SW461]

Hello

I have a HP ProBook 4540s which currently has windows 8 installed.

I want to install windows 10 (full installation not upgrade).

I was having problems in removing the restore partition so I entered the BIOS using the Esc key then entering the BIOS settings and enabling legacy mode.

On saving the changes and rebooting the computer I used the Esc F9 key to display the boot options which displayed prior to my making any changes.  But this doesn't work.

The message that I get on the screen is

Boot Device Not Found

Please install an operating system on your hard disk

Hard Disk - (3F0)

F2 System Diagnostics

For more information, please visit:  www.hp.com\go\techcenter\startup

Instead, the system now automatically enters the HP PC Hardware Diagnostics UEFI page and no matter which keys I press both during boot and after the above screen apears I am unable to return the the boot menu.

I have trawled this forum and man others to try to find a solution with no success as all suggested solutions do not seem to work.

I would appreciate any help that you could suggest.

Thank you in advance for your assistance.

[IT_WinSec]

Hello,

Thank you for posting in the HP Support forum.

3F0 error appears due to the Secure Boot/Legacy mode misconfiguration in BIOS. You should enter the BIOS to fix the problem. And you should not delete your restore/recovery partition because doing so might render your PC unbootable.

There must be some way to enter Esc/F10 again - I have tested this scenario of yours on 2 HP PCs and it worked fine during my tests. Note , it is F10 that you need, not F9

Completely turn off the PC

Press the power on button and doing so immedially start hitting the Esc button (like tap-tap-tap) with energy. 🙂

Or try hitting F10 directly. PC should boot into BIOS. You should either restore BIOS settings to default (load defaults and save) or just touch the Secure boot settings