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?
MacBook Pro with Retina display