I would like to revert MacBook Pro with Linux to iOS X

Although Apple's site said it would be backwards compatible, it is not. I acquired another system that is compatible with the OS X that was downloaded.

Which then brought this window

I am proceeding with the installation.

So now I should be able to proceed and create the USB OS X USB installer.

This means that mention earlier on that site is a contradiction and it would have never worked in the first place.

You actually NEED another older laptop with the OS running an OS X operating system that IS compatible with the version you are downloading.

Thanks

To test this process, I attempted to create a USB installer of a more recent version.

I have a MacBook Pro 2019 with Sonoma. I tried the steps provided, and it worked flawlessly with Sonoma and the USB OS installer was created.

The above was done easily because I have a working MacBook Pro with Sonoma already installed on it.

However, I do not have a working OS X laptop with El Capitan on it.

Is it possible to create a USB installer without a working OS X system?

From the link above [ Create a bootable installer - Apple Support ] it states that

It goes on to say :

So If I am using Sonoma (which is a later version than macOS Sierra) it should work. The contradiction, however is that my Mac must also be compatible with the macOS I'm downloading.

When using Safari to download the El Capitan (10.11.6), using this link : http://updates-http.cdn-apple.com/2019/cert/061-41424-20191024-218af9ec-cf50-4516-9011-228c78eda3d2/InstallMacOSX.dmg

I acquire a file called InstallMacOSX.dm at 6.2 GB

Still updating.... one second...

The above was done easily because I have a working MacBook Pro with Sonoma already installed on it.

However, I do not have a working OS X laptop with El Capitan on it.

Is it possible to create a USB installer without a working OS X system?

From the link above [ Create a bootable installer - Apple Support ] it states that

It goes on to say :

So If I am using Sonoma (which is a later version than macOS Sierra) it should work. The contradiction, however is that my Mac must also be compatible with the macOS I'm downloading.

When using Safari to download the El Capitan (10.11.6), using this link : http://updates-http.cdn-apple.com/2019/cert/061-41424-20191024-218af9ec-cf50-4516-9011-228c78eda3d2/InstallMacOSX.dmg

I acquire a file called InstallMacOSX.dm at 6.2 GB

Using the command for El Capitan will not work as it is in my Downloads folder and the name of the file is called InstallMacOSX.dmg:

sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app

So I rewrote the command as :

sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/elcapitaninstaller --applicationpath /Users/alex/Downloads/InstallMacOSX.dmg

However, I think I messed up the command somehow, as that did not work out.

I was going to convert the .dmg file using dmg2img and then commit the .iso file to USB. Would that work?

"Did you try dropping that .dmg on a thumb drive— then mounting/opening on your problem 2010 Mac.

You double-click the .dmg to launch the installer directly. "

No - as the Macbook 2010 has Linux installed. So it won't launch that .dmg file.

I did dmg2img and was able to create an .iso file.

When I mounted it, I saw the InstallMacOSX.pkg file. Is there anything I can do with that ?

Yes, that did not work because of the contradiction I spoke of earlier.

Unlike when it worked with Sonoma presenting this window,

It stated this package will run a program to determine if the software can be installed. If you select Allow, it immediately states this version of OS X 10.11 cannot be installed on this computer.

Mainly because the OS installer (El Capitan) is not compatible with the Sonoma OS X operating system.

Thanks

Thank-you. I am going to try this now and let you know.

And there you have it...

Thanks for your assistance Leroydouglas.