Windows 8.1 EFI on 2012 13" MBP

Two late 2013 rMBPs (15" and 13") with EFI Boot and 5.1.5621 work flawlessly with this and can switch between OSX and Windows via Startup Disk and Boot Camp Control panel.
The same implementation on a 13" MBP 2012 works, with some issues.
1. No sound.
2. External display via TB using DisplayPort will not see external monitor (Intel HD 400 GPU).
3. Startup Disk on OSX gives 'No bootable device' error, but Control Panel -Boot Camp on Windows side will switch to OSX without any issues.
4. Trackpad has minor issues.
All machines have the MSR partition. On the 2012 MBP, with the ALT key, the Windows partition shows up as EFI Boot and will boot Windows 8.1.
I have also tried the 2012 with Yosemite beta, but it makes no difference.

I have installed all drivers except bootcamp.exe (so it is not in the Control Panel). I have installed Realtek (Audio), Cirrus, Asix (USB Ethernet), Broadcomm, Intel, etc. (using your original list). I can try Intel's update HD driver, if that makes any difference.
I do not see sound devices in Device Manager.

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4. First, you can't install Windows on the SSD. Then, OS X shouldn't ruin Windows because each operating system have got its space

How do i install windows 8 on a late 2012 mac pro?, how do i install windows 8 on a late 2012 mac pro?

how do i install windows 8 on a late 2012 mac pro?

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Maz0327,
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1. Install "Lexmark X646e Class Driver" using a in-box print driver (i.e. one comes with the Windows installation base) .
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What Port Monitor just so I can bubble this information to some others?
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I have Toshiba Serial #XXXXXXXXX, model P75-A7200
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[Moderator edit to remove serial number.]

Satellite P75-A7200
I didnt make a recovery or start up discs?
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Windows 8.1 EFI on 2012 13" MBP

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