Dell Precision 5530 install Pop OS

Hi all

I have a dell precision 5530 and tried to install https://system76.com/pop on it with version 18.10. The Pos OS was flashed with https://rufus.ie/. To boot the Pop OS from USB, the mode "Enable Lagacy Option ROMs" has to be enabled(on the image, it shows not enabled, but enabled it):

Otherwise the POP OS would not boot from the USB stick.

Then, after the POP OS was installed successfully, I am unable to boot the OS. I think, that MBR can not be recognize.

As you can see on the image, the local storage does not appear at all only the USB driver. The POPOS in the boot sequence, I have created, it does not point to the local storage, because I can not choose it.

This is how, it used to be, when Ubuntu 18.04 is installed

The question is, why can I not boot the POP OS and why the local storage does not appear? Which setting is missing?

Thanks