I recently got a broken MacBook Pro mid 2010 model from an acquaintance. The hard drive was broken so I switched it out for an SSD. I installed high sierra using an installer usb created by a friend of mine. High sierra is quite heavy for this older laptop so I want to downgrade to an older version of osx. I tried using shift + alt/opt + cmd + r, which is supposed to give the user access to the installer of an osx version as close as possible to the original shipped os. I only get the option to install high sierra. Is there anything I'm not doing correctly?
Problem downgrading from high sierra to original (shipped) OS
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Best Answer
Go to Apple Store and Download OS X
Click on Purchased to see what is available to you
create bootable disk with that OSX
Restart your Mac, holding the Alt key and, when you see the option, choose the bootable install disk.
Launch Disk Utility, click on the disk with High Sierra on it (the disk, not just the volume) and click the Erase tab.
When the disk has been erased, restart by holding down
Command-R
and wait for the macOS Utilities window to appear.