: mv /tmp/ElCapitan.iso.cdr ~/Desktop/ElCapitan.iso 3. Troubleshooting "Damaged" or Failing Images
hdiutil create -o /tmp/ElCapitan -size 8000m -volname ElCapitan -layout SPUD -fs HFS+J macosxelcapitan10111imageiso work
hdiutil create -o /tmp/ElCapitan -size 8g -type SPARSE -fs HFS+J : mv /tmp/ElCapitan
If you have a legitimate Apple ID that previously “purchased” El Capitan: macosxelcapitan10111imageiso work
Then, create an ISO from the USB:
Working with a macOS El Capitan (10.11.1) ISO image is primarily done for setting up virtual machines (like VirtualBox or VMware) or reviving older Macs that cannot use modern recovery methods Obtaining the Image Apple typically provides the installer as a file, which is the standard format for real Mac hardware . To get a working ISO: Official Source : You can download the El Capitan installer directly from Apple Support Apple Support Conversion