[Mashiro]

The primary Windows operating system was installed in legacy mode. There is no detection of the operating system in the BIOS / EFI / UEFI (legacy). You can only see the hard drive name.

Now to the problem ... The installation of the new operating system was attempted in UEFI mode. In this mode, the operating system can be recognized or the operating system itself can make such entries in the UEFI BIOS boot menu (such as seen in your screenshot).

Please note: Deleting the operating system and / or the partitions of the operating system will NOT remove the entry in the UEFI BIOS. This entry can (e.g.) be removed by completely resetting the UEFI BIOS or it will be overwritten with the installation of another operating system in UEFI mode. Since you have now deleted the operating system or the partitions from it, the entry "PrimeOS" now points to nothing. Therefore, the boot menu always goes back to the beginning.


P.S.: Some of your steps were careless and thoughtless. Removing partitions from other operating systems can cause problems. The 100 MB partition (Windows 7?) can cause problems when deleted. I already had experience with it. Windows has not started up after deleting this partition. Fortunately, the solution was quite simple. Started from a Windows DVD, opened the command line and reinstalled the Windows boot loader or overwritten the old installation (rather said).