Why can't I open the BIOS?

Question

BIOS

Put Linux as the second system, after changing the settings in the BIOS. Bios is launched through F2. Now, before the system boots, I can’t call it in any way to change everything back. If the bootable flash drive is not inserted, then it displays such a message and after 2 seconds it loads Windows. If it is inserted, then it is loaded from it. And for some reason it does not even offer to choose which system to start from. I can't figure out what's wrong. 1- how to enter the BIOS to return all settings 2- how to start already with ubuntu installed.

Answer 1

Reset the settings in the BIOS, it tries to boot from an external device
or change the boot order by putting your HDD or SSD in the first place