Navigate to Contents/SharedSupport and look for a file called InstallESD.dmg.As of writing Apple has a trend of completely removing the links of all the prior version of OS X from its website or App Store, leaving just the most recent one available to download, but if necessary you could request one from Apple by contacting them. If your Mac ran the previous version at any point in the past, you can re-download it from the Mac App Store’s Purchased tab. Right-click on the installer and hit Show Package Contents. The installer should show up in your Applications folder. Buy and download Lion from the Mac App Store. Create a bootable OS X Lion USB stick or DVD based on the Mac App Store download.
![]() Create Bootable Usb Mountain Lion Mac Ran The![]() Make sure the Flash drive or removable media has minimum 8 GB of available free space and formatted in Mac OS Extended (Journaled), with GUID Partition Table scheme.1. Steps to create bootable USB installerOnce you have got the Installation file of Mountain Lion then you can use any blank USB flash drive or other removable media to make it a bootable USB installer for Mountain Lion (OS X 10.8). The alternate option to purchase the Mountain Lion is to borrow the installation file of Mountain Lion from any of your friends who have it and then create the install media with the same file. Enter your Apple ID and password if asked.This may take up between 10 and 60 minutes, depending on your Internet connection speed.If you have never downloaded Mountain Lion from App Store or never ran it on your Mac then you will need to purchase the license code for Mountain Lion and then redeem it as mentioned above in this article. Look for OS X Mountain Lion, hold down the Option key and click Download.Download Mountain Lion to create bootable USB Install Media Launch App Store, and go to the Purchases tab. Navigate to Contents > SharedSupport, then look for the filename “InstallESD.dmg”Create a Bootable USB installer drive for Mountain Lion Look for the file called “Install OS X Mountain Lion”, right-click and select Show Package Contents.Create a Bootable USB drive for Mountain Lion manually Once your download is done, go to Finder > Applications. Now open mounted InstallESD folder from Desktop and mount BaseSystem.dmg file under it. Run the following command ” defaults write com.apple.Finder AppleShowAllFiles TRUE” and “killall Finder” to show all files. Now make invisible file visible to see the BaseSystem.dmg inside the InstallESD.dmg. This may take a minute or two.Create a Bootable USB drive for Mountain Lion Just one last change to fix the bootable installer – open the newly created bootable disk and go to the System/Installation/ folder and delete the alias named Package. Click on the restore to complete the copying process.Restore BaseSystem to create bootable USB installer for Mountain Lion 10.9) or below then you need to go to the restore tab on the right pane and just drag and drop the BaseSystem.dmg in source field and USB drive icon to the destination field as shown in the picture below. But if you are creating this bootable USB installer drive for Mountain Lion on OS X Maverics (Ver. In the new window select the image BaseSystem.dmg under Restore from and click “Restore”.This will make USB/external drive bootable installer. Now click on the newly formatted USB/external drive and go to the edit menu on top menu bar and select Restore if you are doing it on OS X El Capitan or macOS Sierra.Restore Image from Disk Utility in El Capitan to make bootable USB Free windows emulator macErase the existing OS X if required and then install the OS X from utilities menu.2. Now while the USB/external bootable drive is connected shutdown the computer and turn it back on and immediately press and hold Option/Alt key and choose OS X Base System to start the installation process of Mountain Lion.Boot to Mountain Lion using bootable USB installer
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