Ubuntu stuck in BIOS boot menu
I've seen posts about dual-booting and editing the UEFI but nothing to help me so, here goes....
I'm a glutton for punishment so I quadruple boot. Windows XP on a 1TB drive, Windows 7 on a 2TB drive, Windows 10 on a SSD and, finally, LinuxMint on an external USB SSD (which, incidentally, has bad sectors from an older Windows 10 install but works just fine with Linux). "Why?" you might ask. Because I can.
Windows 7 and 10 use the UEFI bootmanager (actually from an EFI partition on the Windows 10 SSD), XP and the external Linux installs did NOT use UEFI. Because of this, EasyBCD won't work editing the boot menu. So, I enter the BIOS, select F8, select the entry I want to boot into and so on. I know, pain in the butt.
My problem is that in that BIOS boot menu, I have an old entry for UEFI Ubuntu which I don't need anymore. I have tried bcdedit commands, VisualBCD, and EasyUEFI to delete the entry. They all SAY it deleted but when I reboot and go into BIOS, it's still there. Easus PartitionMaster shows the partition on the SSD that contains the EFI entries (Windows and ubuntu) but I can't edit it and I certainly don't want to delete that partition. I don't want to take the chance that I'd have to reinstall Windows 10 OR 7. It's not worth it for such a minor annoyance.
If this didn't confuse the hell out of anyone, any suggestions? The added entry doesn't cause any problems other than just being annoying.