Install Mac OS X from Linux
My brother gave me his MacBook Pro but had Linux installed as an OS. How can I get OS X installed on the machine? Do I have to buy a new OS X and boot? Or buy a new SSD hard drive with OS X installed?
If you have one of these Macbook Pros or newer:
Then you can connect straight to the Internet via WiFi or Ethernet to download the latest supported OS X via Internet Recovery.
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Make sure you have a fast connection as it will take a while!
No you don't need to buy the OS, MacOS is free now. You just need to download the OS installer app. Depending on the year of the Macbook Pro 2009? Sierra 10.12.5 might the best choice to start off.
Here's a good reference: How to create a bootable macOS Sierra installer drive
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