Macbook Pro 13" Mid 2012, 8GB RAM, i7 2.9GHz.
So I was using Bootcamp Windows 10 and macOS Mojave 10.14.2, but suddently I could not use the macOS part. I then wanted to wipe the whole SSD and install macOS High Sierra, since I've read that it has less bugs. I have been trying for two days to wipe the drive completely (gparted, diskutil, disk utility), but without success. Is there a way to clean up all the non-needed volumes so that my Mac gets all the space in one drive?
In the Internet Recovery I see Mountain Lion, and I even tried formatting the drive with a Mountain Lion USB, and it also failed.
It's my internal and only SSD in the Mac, and I am certain it is not a hardware failure.