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I am trying to create a bootable USB installer for my mid-2009 iMac, that was completely deleted. Nothing is on the SSD. I tried to boot OS X El Capitan, but it said it could not open the OS X installer .mkpg damaged or missing. I'm running a 2017 iMac on Ventura 13.6.4 to create the install media. Any help would be greatly appreciated.

David Anderson
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Richard Martin
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  • Start at How can I download an older version of OS X/macOS? – Tetsujin Jan 31 '24 at 17:14
  • The direct procedure provided by Apple for creating a bootable USB flash drive installer for OS X El Capitan would be as follows. 1. Download El Capitan from Apple. 2. Use the DiskImageMounter application to mount the download. 3. Use the Installer application to create the Install OS X El Capitan application. 4. Use the createinstallmedia command to create the bootable USB flash drive installer. However, step 3 cannot be completed using a 2017 iMac. It would be helpful if you could edit your question and further explain how you created the bootable USB flash drive installer. – David Anderson Jan 31 '24 at 18:17

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