Non-booting 2019.4 (only one OS)

Hello guys!

I am trying to install the new Kali 2019.4, it will be the only OS in the machine (dedicated notebook)
Everything works well (setup, install and all) until it boots. Instead of the usual GRUB2 menu, it shows "System BootOrder Not found" error for like half a second (had to take a video to read it) and then it stays with the GRUB2 Command SHell.
Never had any problems with previous versions.

I followed this guide -> https://www.linux.com/tutorials/how-...-grub-2-linux/

grub> set root=(hd0,2)
grub> linux /vmlinuz root=/dev/sda2
grub> initrd /initrd.img
grub> boot
and i was able to run the OS in the end.

Then

Code:

---

update-grub

---

and

Code:

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grub-install /dev/sda

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without any error, but when i reboot, I still get the same problem (GRUB2 menu).

Also tried the weekly, without success.

Any ideas?