If you see a black screen or an error message after selecting EFI Boot from your Startup Menu, that means the FixMeStick has not started properly. In these situations, the FixMeStick requires the use of an Advanced Boot Option.
To use the FixMeStick Advanced Boot Options, follow these steps:
Step 1: Start the FixMeStick normally by holding down on the Alt/Option key after powering on the computer and selecting EFI boot from the Startup Menu.
Step 2: After you select “EFI Boot” you will see the FixMeStick logo and three options in upper left corner of the screen. Use the arrow keys on your keyboard to highlight a “Failsafe” option then hit ENTER/RETURN. FixMeStick will start! If you’re still having issues, retry these steps and select another Failsafe option.