Uefi boot options are not being altered on xps 13

Hi,

I earlier posted this under a different title but got no response.

I am trying to add a boot entry to the uefi list so I can boot from external usb flash drive.

Each time I add the entry all looks ok but on reboot the entry has gone.

When I examine the efivars using efibootmgr is looks like below, I seem to be accumulating entries but they are not showing. I have tried to delete them using the efibootmgr without success.

If I do "use default" in the bios screen will it cure this. Also what will the settings be. I have a developer system.

Thanks

ken

BootOrder: 0000,0007,0003
Boot0000* ubuntu    HD(1,800,fa000,4fc1a647-d113-4e94-a1a2-d631ab47f822)File(\EFI\ubuntu\shimx64.efi)
Boot0001*  usb grub    ACPI(a0341d0,0)PCI(1d,0)USB(0,0)USB(0,0)HD(1,800,100000,4bd196b6-c67f-4391-bb82-5c608e5eb8be)File(EFI\grub\grubx64.efi)
Boot0002* usb boot    ACPI(a0341d0,0)PCI(1d,0)USB(0,0)USB(0,0)HD(1,800,100000,4bd196b6-c67f-4391-bb82-5c608e5eb8be)File(\EFI\grub\grubx64.efi)
Boot0003* grub    ACPI(a0341d0,0)PCI(1f,2)03120a000300ffff0000HD(1,800,fa000,4fc1a647-d113-4e94-a1a2-d631ab47f822)File(\EFI\grub\grubx64.efi)
Boot0004* usb    ACPI(a0341d0,0)PCI(1d,0)USB(0,0)USB(0,0)HD(1,800,100000,4bd196b6-c67f-4391-bb82-5c608e5eb8be)File(\EFI\grub\grubx64.efi)
Boot0005* usb    ACPI(a0341d0,0)PCI(1d,0)USB(0,0)USB(0,0)HD(1,800,132000,db995914-b7e3-4075-97c5-59df90e5c4ec)File(\EFI\grub\grubx64.efi)
Boot0006* usb    ACPI(a0341d0,0)PCI(1d,0)USB(0,0)USB(0,0)HD(1,800,132000,db995914-b7e3-4075-97c5-59df90e5c4ec)File(\EFI\grub\grubx64.efi)
Boot0007* UEFI: SAMSUNG SSD PM851 M.2 2280 512GB    ACPI(a0341d0,0)PCI(1f,2)03120a000300ffff0000HD(3,10e800,600000,b010870f-6d8b-47f1-92d5-36fa620b6454)..BO
Boot0008* usb    ACPI(a0341d0,0)PCI(1d,0)USB(0,0)USB(1,0)HD(1,800,100000,4bd196b6-c67f-4391-bb82-5c608e5eb8be)File(\EFI\grub\grubx64.efi)
Boot0009* usb    ACPI(a0341d0,0)PCI(1d,0)USB(0,0)USB(0,0)HD(1,800,132000,db995914-b7e3-4075-97c5-59df90e5c4ec)File(\EFI\grub\grubx64.efi)
Boot000A* usb    ACPI(a0341d0,0)PCI(14,0)USB(c,0)HD(1,800,132000,db995914-b7e3-4075-97c5-59df90e5c4ec)File(\EFI\grub\grubx64.efi)
Boot000B* usb    ACPI(a0341d0,0)PCI(1d,0)USB(0,0)USB(1,0)HD(1,800,132000,db995914-b7e3-4075-97c5-59df90e5c4ec)File(\boot\EFI\grub\grubx64.efi)
Boot000C* usb    ACPI(a0341d0,0)PCI(14,0)USB(c,0)HD(1,800,132000,db995914-b7e3-4075-97c5-59df90e5c4ec)File(\boot\EFI\grub\grubx64.efi)
Boot000D* usb    ACPI(a0341d0,0)PCI(14,0)USB(c,0)HD(1,800,132000,db995914-b7e3-4075-97c5-59df90e5c4ec)File(\boot\EFI\grub\grubx64.efi)
Boot000E* usb    ACPI(a0341d0,0)PCI(14,0)USB(b,0)HD(1,800,132000,db995914-b7e3-4075-97c5-59df90e5c4ec)File(\EFI\grub\grubx64.efi)
Boot000F* usb    ACPI(a0341d0,0)PCI(14,0)USB(b,0)HD(1,800,100000,4bd196b6-c67f-4391-bb82-5c608e5eb8be)File(\EFI\grub\grubx64.efi)
Boot0010* usb    ACPI(a0341d0,0)PCI(14,0)USB(b,0)HD(1,800,100000,4bd196b6-c67f-4391-bb82-5c608e5eb8be)File(\EFI\grub\grubx64.efi)
Boot0011* usb    ACPI(a0341d0,0)PCI(14,0)USB(c,0)HD(1,800,100000,4bd196b6-c67f-4391-bb82-5c608e5eb8be)File(\EFI\grub\grubx64.efi)
Boot0012* usb    ACPI(a0341d0,0)PCI(1d,0)USB(0,0)USB(1,0)HD(1,800,100000,4bd196b6-c67f-4391-bb82-5c608e5eb8be)File(efi/grub/grubx64.efi)
Boot0013* usb    ACPI(a0341d0,0)PCI(1d,0)USB(0,0)USB(1,0)HD(1,800,100000,4bd196b6-c67f-4391-bb82-5c608e5eb8be)File(EFI\grub\grubx64.efi)
Boot0014* usb boot    ACPI(a0341d0,0)PCI(1d,0)USB(0,0)USB(1,0)HD(1,800,100000,4bd196b6-c67f-4391-bb82-5c608e5eb8be)File(EFI\grub\grubx64.efi)
Boot0015* usb boot 2    ACPI(a0341d0,0)PCI(1d,0)USB(0,0)USB(1,0)HD(1,800,100000,4bd196b6-c67f-4391-bb82-5c608e5eb8be)File(EFI\grub\grubx64.efi)
Boot0016* usb    ACPI(a0341d0,0)PCI(1d,0)USB(0,0)USB(1,0)HD(1,800,100000,4bd196b6-c67f-4391-bb82-5c608e5eb8be)File(\EFI\grub\grubx64.efi)
Boot0017* usb 2    ACPI(a0341d0,0)PCI(1d,0)USB(0,0)USB(1,0)HD(1,800,100000,4bd196b6-c67f-4391-bb82-5c608e5eb8be)File(\EFI\grub\grubx64.efi)
Boot0018* usb    ACPI(a0341d0,0)PCI(1d,0)USB(0,0)USB(1,0)HD(1,800,100000,4bd196b6-c67f-4391-bb82-5c608e5eb8be)File(\EFI\grub\grubx64.efi)
Boot0019* usb    ACPI(a0341d0,0)PCI(1d,0)USB(0,0)USB(0,0)HD(1,800,100000,4bd196b6-c67f-4391-bb82-5c608e5eb8be)File(EFI\grub\grubx64.efi)
Boot001A* usb    ACPI(a0341d0,0)PCI(1d,0)USB(0,0)USB(0,0)HD(1,800,100000,4bd196b6-c67f-4391-bb82-5c608e5eb8be)File(\EFI\grub\grubx64.efi)
Boot001B* usb    ACPI(a0341d0,0)PCI(1d,0)USB(0,0)USB(0,0)HD(1,800,100000,4bd196b6-c67f-4391-bb82-5c608e5eb8be)File(\EFI\grub\grubx64.efi)
BootFFFB* Diagnostic Boot          Vendor(5990c250-676b-4ff7-8a0d-529319d0b254,)
BootFFFC* Temporary Boot Menu      Vendor(5990c250-676b-4ff7-8a0d-529319d0b254,)
BootFFFD* Graphic Setup            Vendor(5990c250-676b-4ff7-8a0d-529319d0b254,)
BootFFFE* Text Setup               Vendor(5990c250-676b-4ff7-8a0d-529319d0b254,)