With that T2 chip inside they can block any product from working, any moment after an update… goodluck with that. See whats happening with the new iPhones…!

Just because of that %#*@ T2 Chip this thing should have a 0 repair-ability score!

you need to format the drive first :) hold Command + R when it boots and run disk utility and partition the drive to Mac OSX Journaled, reboot and install.