What do I do? Is there any way I can extract these pictures or what might be left of them? Any way to force it open? Split it up and avoid any bad parts of the image? Fix the image? What can be done? Terminal will not either recognize the image using hdiutil. The file size is the anticipated 27,46gb. The image is mounting with the correct program, diskimagemounter. Since this isn't a download from the internet, but rather an image created directly from the machine none of the other cases I've read about applies. macOS claims that they 'could not be recognized' which I've since learned is a common error on. dmg that I created in disk utility didn't want to mount. Once the Macbook was up and running again on a fresh install those. One of which I know completed and gave a green checkmark. All of it totaled some 25-30 gigabytes of data, saved onto a 32gb stick and put onto my windows desktop for keeping. Before doing that I saved my whole pictures folder - or rather the program that is called 'Pictures' - the app. Only way out was to internet-recover a fresh install of the OS.
A couple months ago my Macbook ran into a bootloop, couldn't get into macos but rather looped after the Apple screen.