FIX BIOS APPLICATION ERROR (501) IN HP LAPTOP
You deleted the efi-partition (HP_Tools). You can get past this message by disabling HP Quicklook 2 in your BIOS.
1. Open up your BIOS (by pressing F10 while your machine is booting up)
2. Go to System Configuration / Device Configurations
3. Look for an option called "HP Quicklook" or "HP Quicklook 2"
4. Set it to "Disabled"
6. Save the changes (hit F10)
7. Restart your machine.