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Mac OS Version: Not yet set

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Hi guys,


I've tried today to install Yosemite without success. It give me error "Mac OS Version: Not yet set".


Can you help me?


- CPU (Intel Core i7-4770k, 3.50GHz)
- Graphic Card (ATI R9 290 Tri-X)
- MotherBoard Chipset (Z87)
Thank you so much

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