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OK, FINALLY I figured it out. It would appear as though the last few people who used UEFI Shells died years ago, and I'm the only one left. But in case there exists a person who owns a Dell XPS 17 L702x system, here's how you delete boot entries from the BIOS.
Step 1. Download the Phoenix Technologies UEFI Shell: Dropbox - UefiShellX64.efi - Simplify your life
Step 2. Format a USB flash drive in FAT32, and create a folder named "EFI", and inside that, create another folder named "boot".
Step 3. Copy and paste the UEFI Shell utility into the boot folder, and rename the file "bootx64". The full path should look like this: EFI\boot\bootx64.efi
Step 4. Reboot your computer, and rapidly tap the "F12" key on your keyboard until you get to the Boot Menu. Scroll down to "Setup" and hit Enter.
Step 5. Now that you're in the BIOS, use the arrow keys on your keyboard to scroll to the Advanced tab. From there, scroll down to Boot Configuration. In Boot Configuration, set UEFI Boot to "Enabled" and Legacy Boot to "Disabled". Hit the Escape key to go back and then go to the Exit tab. Select the option to "Exit SAVING Changes", and go back to rapidly hitting that F12 key on your keyboard.
Step 6. Once at the Boot Menu, select your USB Mass Storage Device, and you'll boot into the UEFI Utility.
Step 7. From there, type: bcfg boot dump -b
This will display a list of boot entries. Take careful note of the "Option" numbers, and make note of the one that you want to delete. In my case, it was Option 05 with a description of "RAID Array". DO NOT CONFUSE OPTION NUMBERS WITH THE BOOT HEX NUMBERS!!! For example, Option 05 had a hex number of "Boot000A". Others will have such numbers as "Boot0005". That is NOT the number you want. You want the option number. It's a two character number after the word "Option". Hit the "Enter" key until the list has fully displayed.
Step 8. Once you know the Option number of which boot entry you want to delete, simply type this command:
bcfg boot rm XX (where XX is the Option number of the entry you want to delete).
For example, in my case, my RAID entry was Option 05. Therefore, my command looked like this:
bcfg boot rm 05
Step 9. Hold the power button to turn off your computer (I don't think there's a "shutdown" command for UEFI Shells).
Step 10. Turn your computer back on, and go back to rapidly tapping that F12 key while doing it. Once at the Boot Menu, go back into Setup. Once in the BIOS, go back to the Advanced Tab, scroll down to Boot Configuration, Set UEFI Boot to "Disabled" and Legacy Boot to "Enabled". Don't forget to exit saving changes.
And that should do the trick. Hopefully I helped at least one person with this post.
Last edited by Crazy Gaston; 02 Aug 2020 at 18:33.
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