How to use macos sierra patch tool for unsupported macs how to use macos sierra patch tool for unsupported | Page 6

4. WHEN THE OPERATION COMPLETES, BOOT YOUR TARGET
UNSUPPORTED MAC OFF THE USB DRIVE YOU JUST CREATED.
Note: Only perform steps 5 and 6 if you intend to do a clean install. Otherwise,
you can simply skip these steps and install to your volume containg a previous
version of OS X, and it'll do an in-place upgrade.