Downgrade late 2013 Macbook Pro to Mountain Lion

Hello,
I've seen a few threads on this and the consensus seems to be that it can't/shouldn't be done. Some of us are in situations in corporate environments where we can't upgrade so please don't post here to tell me I can't/shouldn't downgrade. I started this thread in the hopes that with enough people working on it we can figure out a way to make it work.
I can get my 10.8.5 image to boot my late 2013 Macbook Pro by replacing /System/Library/CoreServices/PlatformSupport.plist with a PlatformSupport.plist from the original 10.9 install. It seems stable however I don't get any sound. No input or output devices show up in System Information --> Audio --> devices. I've tried replacing AudioAUUC.kext and AppleHDA.kext with ones from a 10.9 machine but that doesn't help.
Does anyone have any ideas on how to get the sound working?

Hello tor.support
Did you ever get a solutin for this?
I just spent £1700 on a new MBP to find my audio soundscard does not support Mavericks - normally not such a big deal as I work with computers and thought it would be a simple downgrade to Lion.
Really dont want to take the machine back to apple, but I cant wait for Zoom (audio manufacturer) to get their software updated. It's been 8 months. I need a system that works.
Any help would be much appreciated.
Thank you

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Internet Recovery, and Transferability of OS & iLife Apps
Selling an Old Mac:
• When selling an old Mac, the only OS that is legally transferable is the one that came preinstalled when the Mac was new. Selling a Mac with an upgraded OS isn't doing the new owner any favors. Attempting to do so will only result in headaches since the upgraded OS can't be registered by the new owner. If a clean install becomes necessary, they won't be able to do so and will be forced to install the original OS via Internet Recovery. Best to simply erase the drive and revert back to the original OS prior to selling any Mac.
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Internet Recovery:
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Follow these instructions step by step to prepare a Mac for sale:
Step One - Back up your data:
A. If you have any Virtual PCs shut them down. They cannot be in their "fast saved" state. They must be shut down from inside Windows.
B. Clone to an external drive using using Carbon Copy Cloner.
1. Open Carbon Copy Cloner.
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1. Insert the original OS X install CD/DVD that came with your computer.
2. Restart the computer while holding down the C key to boot from the CD/DVD.
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4. Install OS X.
5. Upon completion DO NOT restart the computer.
6. Shutdown the computer.
B. Lion and Mountain Lion (if pre-installed on the computer at purchase*)
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1. Restart the computer while holding down the COMMAND and R keys until the Mac OS X
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7. Select Reinstall Lion/Mountain Lion and click on the Install button.
8. Upon completion shutdown the computer.
*If your computer came with Lion or Mountain Lion pre-installed then you are entitled to transfer your license once. If you purchased Lion or Mountain Lion from the App Store then you cannot transfer your license to another party. In the case of the latter you should install the original version of OS X that came with your computer. You need to repartition the hard drive as well as reformat it; this will assure that the Recovery HD partition is removed. See Step Three above. You may verify these requirements by reviewing your OS X Software License.

Downgrade late 2013 Macbook Pro to Mountain Lion

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