How can one disable "enable-beagle-flasher"?

How can one undo “enable-beagle-flasher”? I have an image on micro-SD on which I have run “enable-beagle-flasher” that I want to use without it (yet) writing itself to the EMMC.

I can mount the image and edit files on my Linux laptop easily enough, so what do I need to undo?

Last line in /boot/uEnv.txt there should be a text block enable disable this for flashing…