Installing Mountain Lion on an external drive

[eVasilis]

Hi all, I am running HS 10.13.4 and I have been trying to install Mountain Lion on en external drive so I can use dvd studio pro. So far, all I have tried has failed. Whenever I restart form the installer USB stick all I get is a message that the mac was not not shut down properly and the mac boot again with High Sierra. Any ideas? My mac is a 12-core 2010 Mac Pro.

Thanks!

 

[chabig]

I suspect your installer wasn’t built correctly and is not bootable. Check out this tutorial.

https://www.hongkiat.com/blog/clean-install-mountain-lion/

 

[eVasilis]

I suspect your installer wasn’t built correctly and is not bootable. Check out this tutorial.

https://www.hongkiat.com/blog/clean-install-mountain-lion/

That is exactly what I did but no joy. I tried superduper! as well but to no avail.
Cheers

 

[chabig]

Rats. If I think of anything else I will post again.

 

[eVasilis]

Rats. If I think of anything else I will post again.

Thanks a lot!

 

[h9826790]

Burn a disc should be easier

 

[eVasilis]

Burn a disc should be easier

Thanks, I'll give this a try!

 

[eVasilis]

Burn a disc should be easier

Unfortunately, Mountain Lion, Mavericks and Yosemite fail to install. As soon I initiate installation, having booted up from their respective installers, those being on a DVD or USB stick, the process is interrupted by a kernel panic. I can only install 10.6.8 which is of no use as I need NVIDIA's drivers for my GTX 980. It seems to me that the only reason why this is happening, is the upgraded firmware prior to the installation of 10.13.x