Problem installing windows 8.1 on Bootcamp-yosemite

Hello,
I use iMac(21.5-inch,Mid 2011) and was with OS X Yosemite 10.10.1
I want to install window 8.1 on my iMac by using bootcamp and i have a problem.
First, I have created a bootable USB stick with window 8.1. I started bootcamp assistant and i notice that i have only 2 options: don't have create a window 7 or later version install disk.
So I googling the internet a lot then I found it on youtube. I change the plist file in boot camp assistant by deleting pre and add code on terminal. Then i got a first option(create a window 7 or later version install disk).
I made again a bootable usb stick with window 8.1 from ISO with the bootcamp assistant first option. Then when i restarted the Mac keeping the ALT-Option pressed it was only Macintosh HD , recovery-10.10 and EFI Boot.
Why i don't have window partition? I'm so confused. What i've miss?
Please help,
Thanks.

pungpoui wrote:
I use iMac(21.5-inch,Mid 2011) and was with OS X Yosemite 10.10.1
I want to install window 8.1 on my iMac by using bootcamp and i have a problem.
First, I have created a bootable USB stick with window 8.1. I started bootcamp assistant and i notice that i have only 2 options: don't have create a window 7 or later version install disk.
From iMac (21.5-inch, Mid 2011) - Technical Specifications, you have a iMac with a built-in Optical drive.
Slot-loading 8x SuperDrive with 4x double-layer burning (DVD±R DL/DVD±RW/CD-RW)
From Boot Camp 5.1: Frequently asked questions - Apple Support
Can I install Windows from an ISO image?
To find out if your Mac supports that feature, open Boot Camp Assistant, then click the Continue button. If you see a checkbox labeled “Create a Windows 7 or later install disk,” your Mac can install Windows from an ISO image.
Is your iMac Optical drive not working?
So I googling the internet a lot then I found it on youtube. I change the plist file in boot camp assistant by deleting pre and add code on terminal. Then i got a first option(create a window 7 or later version install disk).
I made again a bootable usb stick with window 8.1 from ISO with the bootcamp assistant first option.
This creates a new set of problems and on older Macs does not work very well. Bootcamp Assistant sets the Mac NVRAM to boot from the Optical drive.
Then when i restarted the Mac keeping the ALT-Option pressed it was only Macintosh HD , recovery-10.10 and EFI Boot.
Why i don't have window partition? I'm so confused. What i've miss?
EFI Boot is the Windows installer.
On your Mac, you need to use both a USB and a Physical DVD to install Windows.

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Andy ______________________________________
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Problem installing windows 8.1 on Bootcamp-yosemite

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