UEFI selected as primary option in GRUB customizer

I’ve installed Fedora in my windows machine a while ago for dual boot (I’m new at this) and last month, when trying to get rid of a problem by my own, I set UEFI settings as the primary boot option in GRUB customizer and I’m not being able to start my linux since. When trying to start with Fedora I’m stuck in the loop: BIOS, restart, BIOS, restart… I coudn’t find any solutions to this specific situation online and as said, I’m new to this. Does someone has any idea on how to solve this?

Grub-customizer is known to cause problems with booting for many users.
I suggest you remove it.

You can boot to a live install media then use a chroot environment to remove crub-customizer and repair the booting.

Full instructions for using the chroot environment are available if you need it.

This post has instructions but do not do step 8 or 9. Instead we need to repair what grub customizer has done after you are fully into the chroot environment with step 7.

When doing step 5. I’m getting messages for all items that mount point does not exist.
“mount: /mnt/sys: mount point does not exist.
dmesg(1) may have more information after failed mount system call”
This goes for sys, proc, run, dev, and sys/firmware/efi/efivars

This tells me that you did not get the root file system mounted at /mnt.
What do you see after doing that mount of the file system at /mnt then running ls /mnt.
It should show something such as

$ ls /
afs  bin  boot  dev  etc  home  lib  lib64  lost+found  media  mnt  opt  proc  root  run  sbin  srv  sys  tmp  usr  var

and if you do not see the proc, run, sys, & dev entries there you have selected the wrong partition for mounting.

I’ll try that and update here.
For the steps you shared in the other thread, before step 1. should I be in an specific location (like root or something) or it should work by just starting the terminal?