List EFI entries:

# efibootmgr -v
Timeout: 10 seconds
BootOrder: 0000,0007,0006,0008
Boot0000* rEFInd        HD(2,1b8,64000,f1b7598e-baa8-16ea-4ef6-3ff3b606ac1e)File(\EFI\refind\refind.efi)
Boot0006* Hard Drive    BIOS(2,0,00)SATA: ST32000542AS            .
Boot0007* CD/DVD Drive  BIOS(3,0,00)PATA: HP DVD Writer 1040r     .
Boot0008* INTERNAL EFI SHELL: ST32000542AS      ACPI(a0341d0,0)PCI(1f,2)ATAPI(1,0,0)HD(2,1b8,64000,f1b7598e-baa8-16ea-4ef6-3ff3b606ac
1e)File(\EFI\BOOT\BOOTX64.EFI)

Delete entry 0000 for example:

# efibootmgr -b 0000 -B