OK, let me try a quick walk through of how to do this as UEFI boot. If there is anything you do not understand please ask. This is a bit more difficult as I do not speak or know Italian language.

In the upper left corner you see where it says BIOS, that is not what you want. You want that to say EFI like this:

![Screenshot_20210305_173820|690x368](upload://nTEbrjU931XzsSpv2YN1Tf009QW.jpeg) 

When you first attempt to boot the ISO you select to enter the computers firmware by pressing the F2, F12, or Delete key on keyboard (on most computers). There should be a dialog window that offers you 2 or more choices of what to boot. On my desktop see a choice or booting the ISO as either USB or UEFI and I select UEFI. Exactly what this looks like will depend on the hardware manufacturer.

Then when you get to this point you want to use "Manual Partitioning":

![Screenshot_20210305_173847|690x368](upload://ah6j3NSgWPthu0AZQ4PYxAOX2pS.jpeg) 

Next you select the very first partition nvme0n1p1. This is the 260MB FAT32 partition. Select Edit look for mount point and in the drop down menu look for /boot/efi, select that. Don't format this partition.

Then select the partition where you previously installed OM Lx 4.2. Select that and set the mount point to / (what we call root). Also select to format this partition. Keep the default ext4 file system type.

I believe that is all that would be different from what you have been doing. Hope this is helpful and also that not much information was lost or changed in translating.