Forum Discussion
How Can I Create Bootable USB for Mac OS X Mountain Lion?
I have encountered similar problems before, and I want to install the system on an old Mac. To create a Mountain Lion boot disk on Windows, UltraMDG is a good choice. You just need to download this tool, plug in the Mountain Lion installation package and 8GB USB drive you have prepared, and then use UltraMDG to write the boot disk.
I followed this guide and succeeded!
https://www.howtogeeker.com/make-macos-bootable-usb-on-windows
Compared with other complicated methods, this tool saves a lot of trouble, I recommend you to try it!
Aengusom You can use the built-in command prompt utility to help you make Mountain Lion bootable USB installer on a Windows PC.
Once you have the Mountain Lion DMG file, the first step is to convert it to a format that is readable by the PC. You can do this by using a tool like dmg2img, which is available on most Linux distributions and can be installed on Windows via Cygwin.
dmg2img -i /path/to/MountainLion.dmg -o /path/to/output.img
After converting the DMG file to an IMG file, the next step is to write the IMG file to your USB drive. This can be done using the dd command, which is a powerful disk copying tool available on Linux, macOS, and via various utilities on Windows.
sudo dd if=/path/to/output.img of=/dev/sdX bs=1m
Once the process is complete, your USB drive will be bootable and can be used to install Mac OS X Mountain Lion on a compatible Mac. You can verify the USB drive by attempting to boot from it on a Mac. To do this, insert the USB drive, power on the Mac, and hold down the Option key to select the bootable USB drive. If all steps were followed correctly, you should see the Mac OS X Mountain Lion installation screen.