Hi Henry,
Thank you for your updates.
Just want to know whether this model is supported for Yosemite OS X. I have a USB bootable (Yosemite), When I pressed power button, pressed the Option key to select the USB pen drive. Once selected the drive and hit enter it gives a no enter symbol. The same Yosemite bootable pen drive works in another laptops and mac minis.
How to find out that the MacBook Pro laptops are not degradable to lower OS X versions. Any specific firmware (version) or by seeing the no entry symbol.