Step by step Mavericks Installation Guide.
1: READ EVERYTHING TWICE
2: THINK TWICE
3: Ask for clarification
Remember that you need a Mavericks compatible GPU, else you will have slow (unusable) graphics until hackerwayne/MLforAll will release a fix.
ANY HARM OR DAMAGE CAUSED BY THIS GUIDE HAPPENED UNDER YOUR OWN RESPONSIBILITY!
Be sure to have root privileges (administrator password) as OS X will prompt you for this on some stage.
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A: PREPARING THE INSTALLATION DRIVE
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1a: Make a BACKUP of your system
2a: Get a copy of the Mavericks Installer (if you do not have it already use the "Mavericks download enabler")
3a: Download the attached file:
https://forums.macrumors.com/posts/18423059/
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1b: Get an empty USB-Stick (8GB or more)/use an external hard disk
2b: backup everything on the drive to another drive
3b: open Disk Utility and select your drive for installation
4b: select the partition tab -> advanced options -> GUID
5b: chose a drive name -> select HFS+ as the partition format -> partition the drive
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1c: in Finder right-click the app and select show package contents
-> navigate to /Contents/Resources/SharedSupport and double-cick the dmg-file
2c: show hidden files in Finder (use included DisAppear.app)
3c: in Finder navigate to the Drive you've just mounted
4c: locate BaseSystem.dmg -> drop it to the lower Disk Utility side pane
5c: select your previously created install partition (not drive!) -> restore tab -> drop the image from the side pane to the source field
6c: restore
7c: in Finder locate the mounted InstallESD and copy the "Packages" folder
8c: past the folder to /System/Installation/ -> you will need to replace the file in there
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1d: copy the content of my "Installation 10.9" folder to the install drive as advised by the folder names -> you will have to replace the files present (pay attention to the boot.efi file - use the downloaded one, not the place-holder)
2d: run the IORegistryExplorer.app -> make sure in the top left corner IOServices is selected
3d: under root select your Mac(model) -> on the right at the top copy the board-id value
4d: open /System/Installation/Packages/InstallableMachines.plist -> search for the last entry and replace it
5d: open /System/Library/CoreServices/PlatformSupport.plist
-> search for the last entry of board-ids and replace it
-> search for the last entry of Macs and insert yours as found in the IORegistryExplorer.app