grub customizer image locked with peppermint 7 os image

Hi,
I recently installed Peppermint OS 7 on a desktop with Linux Mint, LXLE and Windows XP. Grub Customizer is installed in each of the Linux Systems and has worked without a flaw until my update from Peppermint 6 to Peppermint 7. Peppermint 7 installs a boot image which I have not been able to remove or replace from any of these system profiles using grub customizer to install that system's grub profile to the boot. If an attempt is made to replace the image, the new profile is installed but no image can be installed. The only image that can ever be brought back is Peppermint 7's default install to boot image.
I would be inclined to believe that the image installed by Peppermint 7 is going directly into the boot sector. How one would remove that is beyond me. It reminds me a bit of some kind of Windows snag. In other words: Annoying.
It would be nice if grub customizer would have the ability to remove such an image from the boot sector (or wherever it may be hiding). I certainly don't know how to get it out.
In the meantime, if you might have any advice as to how to get this image out so I can re-customize my boot to my own preferences, it would be highly appreciated.
Otherwise it occurs to me that on my many different devices this is probably soon going to be a problem as new releases of their OS appear. Such much for being able to customize your boot, a new option which I was enjoying.