Need help installing Win8.1 from USB on MBP.

I have tried so many different things to get Windows 8.1 installing on my MacbookPro Late 2011 via USB.
I have modified the Bootcamp app as to allow me to create a usb installation from .iso.
Those instructions are here:
Enable Bootcamp to install from usb for OSX 10.9**WORKS**
However upon following through and rebooting after partitioning the MBP just goes to a black screen and I get "No bootable device found"
I have tried creating a usb drive by cleaning, formating, and setting active a usb drive in Windows via diskpart. I then copied all elements
from my Windows 8.1 Pro iso to it. However this only gives me EFI boot option on the boot select screen when holding option.
The clean,partition,active steps were found here:
Enable Bootcamp to install from usb for OSX 10.9**WORKS**
EFI boot has never worked for me. It always results in windows install saying that the installer can't install to non GPT disks.
Whenever I try to use EFI boot on the USB installer, the Windows 8.1 installer won't install to the parition that either I have made with the bootcamp utility or simple another fat32 parition I made myself without the bootcamp utility. (Hyrbrid MBR vs strict GPT?)
After all this, simply inserting a windows 8.1 DVD into the drive I get the magical WINDOWS boot option in the boot option menu and I can install fine.
Why can't I get USB install of windows working.
I also still don't understand why EFI install never works for me.
This is in regards to a late 2011 MBP with dvd drive. It is running Yosemite.

You can use nvram (https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/ man8/nvram.8.html) but the issue is one of timing. If you are in BCA and BCA sets values and restarts, if you interrupt it using Alt key, switch to OSX (which will cause nvram to change as well), change nvram by guessing what BCA sets, and start again, what is not being set in nvram is lost.
In your specific case, is the Optical drive broken for you to try and attempt a pure USB-only installation?
If you make partitions using DU, and want BCA to use them, you must ensure an equivalent MBR set of entries.
BCA was designed to take care of all this anyway.
The easier method that I have suggested (via Feedback, to Apple Engineers) is to release firmware updates for all machine considered capable of running Yosemite/Mavericks and let them become UEFI compliant. If the CSM-BIOS layer already provides BIOS equivalents for EFI and Windows works using these with a Hybrid MBR, the EFI cousins should also work.
The other challenge is that W7 has EFI support, but full UEFI is available in W8+. There is no motivation on either side to retrofit older OS/HW to make it all work together for the convenience of the consumer.

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How do I install Windows from USB?

I have a 2011 MacBook Pro. I replaced the optical drive with a second hard drive. I have tried the following methods to install Windows.
Installing from an external optical drive: I created a Windows 7 install disk. The windows installer does not start. All I see is a blinking cursor. The disk is recognized when I hold option/alt at startup, but when selected it hangs at the blinking cursor.
Installing from a flash drive: I burned the image to a USB flash drive. The windows installer does not start. The the disk is not recognized when I hold option/alt at startup.
Do I have to do something to enable USB startup? Is there another installation method available?
Thanks.

On MBPs that came with built-in Optical drives, BC Assistant modifies the NVRAM settings and sets the boot option to be the Optical drive. Removing the Optical drive breaks this logic and causes a lot of problems. Modifying the Bootcamp info.plist allows USB creation workaround, but does not allow the NVRAM modification. This is derived by BCA using the Model Identifier in System Profiler.
Your situation is similar to Need help installing Win8.1 from USB on MBP. or Unable to Install Windows 8 on secondary Hard Disk.
The only solution I know is to move the drive that needs Windows to the main SATA connector, install Windows and then move the drive back to the Optibay.
If you have two Macs, one of which have the original HW configuration, than using Winclone is another option by installing it on an "unmodified" MAC and then cloning it to the "modified" Mac.

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In any case I would suggest to get an audio interface which is *Core Audio* compatible. This means that you just need to plug it in and it will work with OS X’s integrated driver. I once had an M-Audio interface which needed its own driver and it had latency problems because of them. I am currently using the EDIROL FA-66 with 10.6.3 on my MacBook Pro. It still works flawlessly and has worked without problems in the past with 10.4 and 10.5, too. Here is how it looks like: http://www.rolandus.com/products/productdetails.php?ProductId=731
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My Superdrive is far from super anymore, So I managed to make an extern drive with both Snow Leopard Partition, Lion Partition (Since I thought Boot Camp 4,1 would bypass my problem), and Time Machine partition, Since I got 1. USB drive that works.
- My general issue is that Boot camp Refuse to see the USB drive - (Many "how to"´s though show how they install windows perfectly through the USB port, but they use airbooks!, and somehow the Macbook will not ?)
I fix that issue with >> rEFIt <<, that suddenly makes it possible for the Mac to see the USB drive, and partitions.
Which was very strange since I could use an extern HD with the whole installation to start up wipe the whole disk, and then use my extern drive with partitions to install Snow Leopard and get everything as before with timemachine. Very smart with timemachine, but very lucky that I have a extern drive that runs the whole system and that I made the partitionsdrive before. DVD-drives are the past!
Point: So the original system could see the Snow Leopard installation USB disk, but boot camp cannot find the USB drive ?????????
After rEFIt I booted and then I got this error:
Starting bootmgr.efi
Error: Unsupported while loading bootmgr.efi
I read it could be a problem with the Windows software, so I purchased an extern DVD drive, Used Disk Utility to make an image (.DMG), then used another program to convert the .dmg to .ISO.
Then downloaded a trialversion of vmWare fusion, and installed windows from the iso. Everything worked brilliant, except and that is why I want to use boot camp, Running windows in another program while running the mac system is a little hacky and slow.
Point: Nothing is wrong with the windows software, and windows runs fine.
I then downloaded the Windows DVD / USB Tool, reformatted a USB drive as Master Boot Partition, MS-Dos Fat partition, then after lots of struggling got Vmware, windows to recognise the USB drive. And installed the windows software on the USB drive, as all the walkthroughs recommend.
Then I tried for "fun"! to just install windows form the extern USB drive, and with rEFIt it will see the drive and start to do something, but then when it starts to boot, the screen just turns into black and nothing happens, and you can see the drive does NOTHING. (I think it is because I only have 1 USB drive and the Extern DVD drive does not get enough power, but again the mac refuse to see the USB drive unless it is a Snow Leopard installation USB-drive!
Well trying to install Windows Ultimate 64 Bit, which worked great in vmware, because that program installed from the .ISO file that I had on the desktop, but trying with Boot Camp did not get anywhere, what kind of **** program is this boot camp anyway!?, but then I try the new USB disk with windows made from windows, thorugh rEFIt, it sees the disk and then starts and then I get this ERROR:
rEFIt - Booting Legacy OS
Starting legacy loader
Using load option ´USB´
Error: Not found returned from legacy loader
Error: Not found from LocateDevicePath
(x 9 times)
Error: Load Error while (re)opening our installation volume
The firmware refused to boot from the selected volume. Note that external hard drives are not well-supported by Apple´s firmware for legacy OS booting
(Hey Apple please send out a updated firmware that fix this issue?!)
So how do I do it ? - or is the only option to fix the partition running the system from the extern disk. Format the whole drive in 2 from the "bottom" and install windows and then afterwards install Mac on the other partition ? Or just run windows on the mac and forget about mac software ? What a stupid solution...

There are strings in the pliist file to add other Macs so that you can use some USB-DVD drives.
This is 5 page thread, so a little more 'meat' to it:
https://discussions.apple.com/thread/3410900?start=60&tstart=0
And on PC booting Windows from a USB DVD to do the install is usually a piece of cake, sometimes you just need to specify that USB in the BIOS boot order and sometimes select via F12 (or another Fkey) and that is it.
What you have here seems to be everything and everyone is excluded unless there is a mac-model device ID string that specifies yes. An unnecessary hurdle.

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Hello,
Thank you for posting in the HP Support Forum.
Your computer comes with Win 8 pre-installed but one of the steps to install/run Windows 8.1 is having updated drivers for Windows 8.1
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If Windows 8 in place, then , please read this article and enroll in the steps:
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Best wishes,
IT_WinSec
Hewlett-Packard employee | HP Enterprise Services
Although I work for HP, I express my personal opinion.
Visit www.hp.com/makeitmatter
--Say "Thanks" by clicking the Kudos Thumb Up in the post that you find useful.
--Please mark the post that solves your problem as "Accepted Solution"

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RE-RE-RE REPITO, NO ENTIENDO NADA DE INGLES, PARA ESTE IDIOMA SOY COMPLETAMENTE NULA, POR FAVOR TODOS LOS MENSAJES, NOTAS, ECT., MANDEN EN ESPAÑOL.
Date: Thu, 29 Sep 2011 15:13:29 -0600
From: [email protected]
To: [email protected]
Subject: Need help Installing Flash player 10.3 for firefox. It stops at 50%
    Re: Need help Installing Flash player 10.3 for firefox. It stops at 50%
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