IMac 5 k unable to boot Yosemite?

Hi guys, I am absolutely stuck!

So I just bought an imac end of 2015 5 k (27 "250 GB SSD) that comes with El Capitan, but I need to downgrade to my music software/hardware.

I made a bootdisk of Yosemite and verified that it works with my older macbook, however when I try to run it on the new mac I just get blank circle sign prohibitive and after awhile it turns off.

Any ideas why this won't install? Is it possible to format the internal flash ssd drive or is the firmware that need an update or something?

Any help would be greatly appreciated

See you soon

KayD

The new iMac can not be started except bye El Capitan.

Make your own installer from El Capitan flash drive using the El Capitan tool:

You can create an installer of flash of El Capitan via the Terminal drive. El Capitan has its own manufacturer Installer integrated that you use via the Terminal:

You'll need a freshly partitioned and formatted at least 8GBs. USB flash drive leave the name of the flash drive on the system by default, "Untitled." Do not change this name. Wait as the full process that will take some time.

Open the Terminal in the Utilities folder. Copy and paste the following line in its entirety in the Terminal window.

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

Press RETURN, enter the admin password (will not resonate to the window) then press RETURN again.

You must have setup in your Applications folder or change the paths in the command line above.

Tags: Mac OS & System Software

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