Boot / UEFI no longer starts?

Re
4

I recently started my boot menu, then I set something and now it doesn't start anymore. When starting the laptop, I tried to press F2, F1, Esc and insert, delete. And I tried to press the windows symbol on restart and pressed shift, then I could select everything in the extended options menu.

But now I can't open anything using either of the two options. It always starts without opening the UEFI, what can I do now?

I thank you in advance

Va

Reset bios.

Re

How do you do it and what happens in the process? And what can go wrong?

Va

Not really.

Settings are deleted and the bios is set to default.

Re

And how does that reset?