This sounds good, but how do you go about getting rid of the incompatible disk message without repartitioning and erasing the whole disk? On my Macbook Pro 2015, I had installed Ventura through a hack called Opencore Patcher, but after an update to 13.*.6, the graphics drivers were broken, so after reinstalling Opencore Patcher itself, it completely broke the system. So I booted using usb, copied my files and reinstalled Mojave (which flies twice faster as Ventura on the same machine so I will not upgrade again), but I had forgotten to repartition the hard disk. I could get rid of Opencore's reliquate bootloaders by deleting its EFI's after mounting them manually from Terminal, but now I would like to get rid of this Incompatible message without reinstalling the whole system. I already spent some time reinstalling all my apps, accounts (Google's and Apple's are ... not to be taken lightly) and all my Macports so I would like to avoid the hassle and find a way to this from Terminal in Mojave.