There is a program called EFIStudio which would generate the EFI string after you select the card that you have from the list (within the application). Then once you click on Add Device, it will generate a string (known as hex string) for you and it will give you an option to save it directly in the com.apple.boot file. Once its saved, remove the injector file (I assume in your case its Natit.kext) and restart the machine.

Also before you save it to the com.apple.boot file, make sure you make a copy of the file in your root drive. Its located in /Library/Preferences/SystemConfiguration. Just incase if the string doesn't work, you can revert back to the original one.