I screwed up in the bios, how to fix it?

Question

linux

Installed Linux, and to be more precise - Ubuntu. During installation, as expected, disabled secure boot.
Everything was installed, everything worked, until my curiosity came into play.
So I decided to experiment with the BIOS. (notebook ASUS F402C bios - Aptio setup utility version 2.15.1227). I went to the Boot tab. This tab contains a list of "Boot option" which consists of sub-items like:
Boot option #1 [PCI(1F|2).....]
Boot option #2 [.....].
And below are two items:
Add new boot option
Delete boot option
So, I took and deleted all the items. After that, the BIOS stopped seeing the hard drive. I rebooted the computer, went to the boot media selection menu, it did not help. Can only boot from a flash drive. I tried reinstalling ubuntu, didn't help. Ubuntu sees the hard drive, put it on a negog, but the computer does not see it.
I tried to reset the bios (I clicked the "restore defaults" item). On the Internet, they suggested disabling secure boot and enabling Launch CSM. did not help.
I have an option to remove the battery, do you think it will work? In general, I don’t want to disassemble the laptop, since it is under a two-week warranty after repair (there were power problems).

Answer 1

Download the BIOS update from the manufacturer's website and flash it.

Answer 2

Open the BIOS / EFI settings with the [Esc] button (boot options) and select Enter Setup.
Go to Boot > Add New Boot Option .
New Boot Option enter NAME to login (whatever is convenient).
Select the file system using the correct PCI device path for the boot drive from available
Path for boot use \EFI\Manjaro\grubx64.efi (For Manjaro)
or
Path for boot use \EFI\BOOT\BOOTXx64.EFI (For Windows)
Click Create .
Save the changes in BIOS Setup using the [F10] button. Reboot.
grubx64.efi can be taken from /boot/grub/x86_64-efi/core.efi
sudo cp /boot/grub/x86_64-efi/core.efi /boot/efi/EFI/boot/bootx64.efi

Answer 3

Select F9 "SETUP DEFAULTS", then press F10 - "SAVE AND EXIT", select "YES". You don't have to disable Secure Boot at all if you're using Ubuntu. Just at startup, select the media from which you want to boot. Perhaps yours will be the F11 key.

Answer 4

https://ubuntuforums.org/showthread.php?t=2052009

Answer 5

I'm not sure if this thing will work in a laptop, but there is a magic jumper on full-sized asus boards
www.asus.com/us/support/FAQ/1000851