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Chimera bootloader not showing up

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I want to install Windows 7 and Yosemite Zone in Dual Boot. I installed Windows 7 first, then I installed Yosemite Zone using an USB Flash Drive.

Now I have got a huge problem: It doesn't show Chimera on boot-up, the laptop boots straight into Windows. I can only boot OS X using the USB Flash drive. Can anyone help me with this weird problem?

Laptop specs:

Lenovo B50-70
Intel Core i3-4030U
Intel HD Graphics 4400
500 GB HDD (150GB Windows MBR + 350GB Mac MBR)


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Boot with your USB into the Yosemite partition, open the installed app "Chameleon Wizard", select Update and press Install, once its finished select the first option "Boot0hfs" and press install again.

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