Bootcamp 5.1.1 on Mac Pro Cylinder can't install Windows 8

Question

Hi,
I've gone through almost every discussion regarding the common issue "Windows coud not update the computer's boot configuration" but none is related to Bootcamp version 5.1.1 and latest Mac Pro cylinder.
I already tried the solution presented by Jarvil at this discussion: https://discussions.apple.com/message/23545780#23545780
Based on Jarvil's solution there is a very important thing that is not happening in my case, that is that I never get the option to boot from the "Windows" partition. I only have 3 options, 1) Macintosh HD 2) Recovery 3) EFI Boot.
By not having the option to boot from Windows partition I automatically deviate from Jarvil's solution.
So, I proceed with EFI boot, I reach the step where I have to select the partition and I pick the 4th partition and it says that Windows can't be installed in this partition so I delete/format it and proceed with installation and it goes all well until the very end where it's finishing the install that I get the message:
"Windows coud not update the computer's boot configuration".
I also tried skipping the install --> login into Mac OS X --> Disk Utility --> Delete partition --> Create ExFAT partition (tried FAT also) --> Reboot --> EFI Boot (Windows partition still not available) --> Format partition --> Proceed with install --> Same error again.
After the error, it reboots and then I get a blue screen (**** Windows blue screens) with a message:
Recovery
Your PC Needs to be repaired
The Boot Configuration Data file is missing some required information.
File: \BCD
Error code: 0x0000034
You'll need to use the recovery tools on your installation media. If you don't have any installation media (like a disc or USB device), contact your system administrator or PC manufacturer.
So I reboot holding Option key and now the partition Windows appears and if I boot from it I get the same blue screen with the recovery error. So I reboot again and login into OSX, go to Disk Utility and delete the "Untitled" partition and I recreate it using ExFAT but then it gets stuck "Preparing to partition disk".
I'm attaching snapshots.
I really hope that someone from Apple support can provide a solution. Thank you very much in advance.
Alejandro

Answer 1

It's not an Apple response but it is something which worked for me. This is an exerpt from a post I made on another site. It's a bit involved and you may think this should not be necessary (and you'd be right) but if you want to try it you're welcome. No guarantess.
Install Windows again just like you did before with Bootcamp (but you may have to remove any traces of it first).
So starting again with Bootcamp Assistant and with Macintosh using the whole disc again begin the process.
Allow Windows to be installed as normal.
When the BCD error box opens up DO NOT click on OK - immediately do a hard shutdown of the Mac by holding the power button. This is so the changes are not rolled back.
Start up the Mac again holding the Alt key and choose the USB EFI Boot option in the boot menu (it will be orange). At this point if you get a Windows blue screen error shutdown and take out the USB then restart the machine holding Alt and at the boot menu plug in the USB again and do the above.
At the installer's start screen press shift + F10 to get a command prompt.
In the command prompt type
diskpart and hit enter
type
list volume  and hit enter
Note the volume letters and numbers of all the volumes .  One should be an EFI partition of type FAT32 and it will have no drive letter.
Now type
list volume and hit enter (note the letters and numbers of the displayed volumes) One will be your EFI partition of FAT32 type and it will have no letter, just a number.
type
select volume X (where X is the number of your EFI partition) and hit enter
type
assign letter=B and enter
type
exit and enter
type
bcdboot C:\Windows /l en-GB /s B: /f ALL   *** note the /l en-GB is for locality and language and will default to English US if not changed. Obviously you need to change to your own locale and language code***
press enter (after checking all spaces etc). You may also struggle to find the \ key on your keyboard, it may change position once in command prompt!.
After a few seconds it should report that the boot files were written. If it does that you can type in
wpeutil reboot and press enter at which point your Mac will reboot. Hold the Alt key and choose your new EFI Boot option and hopefully Windows will boot.
Obviously all of this can be a little daunting and should not be taken on lightly. Having said that Windows is not currently installing and you've got nothing to lose. You can always go back to what you have now (with TM backups of course, and maybe even without).
Good luck