How to downgrade from Yosemite to Mavericks

[iMore.com]

Installed Yosemite developer preview and regretting it? Downgrade to Mavericks by following these instructions​

You've installed a developer preview of OS X Yosemite, and you didn't take my previous advice to partition your hard drive. Now you're in a pickle: For whatever reason, you need to downgrade to Mavericks. How do you do it? Let's take a look.

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