UniBeast: Install OS X Mavericks on Any Supported Intel-based PC

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Nov 17, 2009
i5 10600K
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The following guide is a complete walkthrough to installing or updating to the latest version of OS X. It requires no experience and all of the necessary installation and post-installation tools are available on

UniBeast is a tool that creates a bootable installer out of your downloaded version of OS X. In order to start fresh, you'll need access to a functional computer running Mac OS X Snow Leopard 10.6.8 or later. This is a requirement, as you need access to the Mac App Store to download OS X and create the installation drive. To start from scratch, booting the 10.6 Snow Leopard Retail DVD directly, check out iBoot + MultiBeast.

UniBeast Overview

1. Download the OS X Mavericks Application from the Mac App Store
2. Prepare a UniBeast USB flash drive
3. Install OS X Mavericks
4. Install the bootloader and drivers using MultiBeast

Before You Begin

1. Register here at If you don't have a user account, create one!
2. Get our latest MultiBeast and UniBeast tools from the downloads section.
3. Purchase a 8GB or larger USB drive.

STEP 1: Download OS X Mavericks

The full operating system is a free download for anyone who has purchased Mac OS X Snow Leopard, Lion, or Mountain Lion. Download the Application from the Mac App Store using your Apple ID on any Mac or functional computer running Mac OS X 10.6.8 or later.

1. Open Mac App Store
2. Log in with your Apple ID
3. Download OS X Mavericks

The Application Install OS X Mavericks will appear in /Applications.

STEP 2: Create a Bootable USB Drive with UniBeast

Take a deep breath and take your time- this is pretty simple, but it's easy to miss things if you rush. Follow each step to the letter.

1. Insert the USB drive
2. Open /Applications/Utilities/Disk Utility
3. Highlight the USB drive in left column
Screen Shot 2013-10-11 at 8.27.02 PM.png
4. Click on the Partition tab
5. Click Current and choose 1 Partition
6. Click Options...
7. Choose Master Boot Record
Screen Shot 2013-10-11 at 8.27.38 PM.jpg
8. Under Name: type USB (You can rename it later)
9. Under Format: choose Mac OS Extended (Journaled)
10. Click Apply then Partition
Screen Shot 2013-10-11 at 8.28.01 PM.png
11. Download and run UniBeast
12. Click Continue, Continue, Continue, Agree
Screen Shot 2013-10-11 at 8.33.06 PM.png
13. At Destination Select, choose USB and click Continue
Screen Shot 2013-10-11 at 8.33.12 PM.png
14. If using a Socket 1156 system without Rate Matching Hub (RMH) USB choose Legacy USB Support
15. If using a laptop, choose Laptop Support
16. Click Continue
17. Enter password and click Install
Screen Shot 2013-10-11 at 8.33.27 PM.png
UniBeast will now create the bootable USB drive. The process will only take about 10-15 minutes, depending on system and drive speed, but will show hours. This is normal. Do not unplug or stop during this time.

18. Drag MultiBeast to your completed USB drive.

STEP 3: Recommended UEFI Settings

If you're installing on a recommended CustoMac desktop with AMI UEFI, the options are simple. For other systems make sure to set your BIOS or UEFI to Optimized Defaults, and your hard drive to AHCI mode. Award BIOS settings are listed here.

1. To access BIOS/UEFI Setup, press and hold Delete on a USB Keyboard while the system is booting up
2. Set to Optimized Defaults.
3. (Optional) Set X.M.P. Memory Profile to Profile1
4. If your CPU supports VT-d, disable it
5. Save and exit.

For best results with the latest 8-series motherboards and Haswell CPUs, remove all but 1 stick of RAM for the installation process. You can put back extra RAM sticks after post-installation is finished.

STEP 4: Install OS X Mavericks

You're almost done! All you need to do is boot from the USB drive and install!

1. Turn on the computer
2. Press the hotkey to choose boot device
  • If you have a Gigabyte motherboard press F12
  • If you have a ASUS motherboard, press F8
3. Choose USB-HDD
4. At the Chimera Boot Screen, choose USB and hit Enter

If you have trouble reaching the installer, type -x at the Boot screen as shown below. You can type the boot flags GraphicsEnabler=Yes, maxmem=4096, PCIRootUID=1, PCIRootUID=0, and npci=0x2000 by themselves or together in order to solve boot issues for older graphics cards and machines. Type -v to bypass the Apple boot screen and enter verbose startup mode. For further explanations of boot flags, check out the post here. Also, if you need help with what to use for your graphics card, see the post here.


5. When you arrive at the Installer, choose language.


6. For a new installation of OS X, you MUST erase and format the destination drive according to the following steps before continuing. If you are upgrading from Snow Leopard, Lion, or Mountain Lion and you want to keep your files and apps, skip steps a-j.
a. In the top menu bar choose Utilities, and open Disk Utility
b. Highlight your target hard drive for the Mavericks installation in left column.
c. Click Partition tab
d. Click Current and choose 1 Partition
e. Click Options...
f. Choose GUID Partition Method
g. Under Name: type Mavericks (You can rename it later)
h. Under Format: choose Mac OS Extended (Journaled)
i. Click Apply then Partition
j. Close Disk Utility

7. When the installer asks you where to install, choose Mavericks, or your existing install.
8. Upon completion, restart the system.

STEP 5: Post-Installation Using MultiBeast

MultiBeast is an all-in-one post-installation tool designed to enable boot from hard drive, and install support for Audio, Network, and Graphics. In addition it includes System Utilities to repair permissions and a collection of drivers and config files. The installation is complete, but the drive isn't bootable yet. Boot from the USB again, this time choosing Mavericks.

1. Turn on the computer
2. Press the hotkey to choose boot device
  • If you have a Gigabyte motherboard press F12
  • If you have a ASUS motherboard, press F8
3. Choose USB-HDD
4. At the Chimera Boot Screen, choose your new Mavericks installation.

5. Complete Mac OS X Mavericks setup
6. Open and run MultibeastMB1.png7. Click Quick Start to choose EasyBeast, UserDSDT, or DSDT-Free
8. Click Drivers for Audio, Graphics, and Network options
9. Click Customize for further options
10. Click Print or Save to back up your configuration
11. Click Build then Install
12. Restart computer to complete installation

Yay! You now have a fully updated bootable version of OS X Mavericks on your CustoMac! And a super handy USB rescue drive. It's easy to get frustrated, but don't give up! If you get stuck, there are many users with similar hardware in the tonymacx86 Forum to provide support. Special thanks to everyone in the community, and our moderators for testing!

mavs mb.jpg

If you've had success using this guide, consider a contribution to help keep the sites going. We're constantly updating and tweaking our tools to help you. Good luck and have fun!

UniBeast 10.8 Mountain Lion Guide
UniBeast 10.7 Lion Guide
iBoot + MultiBeast - 10.6 Snow Leopard Guide
Simplest OS X Installation Guide
Quick guide to configuring the UEFI on Gigabyte's 7-series LGA-1155 motherboards

Troubleshooting and Optimizations:
boot0 Error: The Official Guide
How to Fix iMessage
Mavericks: Native CPU/IGPU Power Management
Issuing Boot Flags
How To Know What to Install With MultiBeast
Install Bootloader and Extra to EFI Partition
Chimera HD Graphics Bootflags: IGPEnabler, IGPlatformID, and IGPDeviceID
The Basics
HDMI Audio
tonymacx86 Search
tonymacx86 Wiki


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Last edited by a moderator:
Apr 21, 2011
GA-Z68MX-UD2H-B3 (U1E)
i5-2500 3.3GHz
XFX Radeon HD 6870
Classic Mac
Mobile Phone
  1. iOS
When Mountain Lion came out, the 68XX cards were having serious issues. If your CPU didn't have internal graphics you had to swap in a different graphics card. Anyone know if that's still the case?
Sep 7, 2012
Intel i5 2500
nVidia GeForce GTX 570
Classic Mac
Mobile Phone
That was fast o_O
Jun 13, 2012
Gigabyte GA-P67A-UD3-B3
Intel Core I7 2600K
Nvidia Geforce GTX 960
  1. MacBook Air
Mobile Phone
  1. iOS
Nice. I will do the update method and report any issues.
Jun 15, 2013
Win 8.1 / Mac 10.9.2
Core i5
Radeon 2gb
  1. Mac Pro
Classic Mac
Mobile Phone
wht about probook 4540s
Jul 20, 2013
Tim's Haswell Hackintosh
Core i5 4570 Quad Core 3.2GHz + stock CPU fan
Asus GeForce GT 630 2GB 'Silent' (Kepler)
Classic Mac
Mobile Phone
Would there be any chance of supporting Fusion Drive configurations in a future release of Multibeast? As far as I understand, this involves copying Chimera's boot0 to the Master Boot Record of each constituent physical drive and boot1h, boot and the Extra folder to the hidden boot partitions of each drive (which were created automatically by Core Storage). That sounds relatively easy but I can never be sure these are all in sync and when the machine simply won't boot it is hard to know what is happening and why.

A little help from Multibeast would go a long way.

I think there is the same issue making a partition bootable on a drive with a Time Machine partition too - OS X defaults to a `Core Storage arrangement which defeats a naive Unibeast/Multibeast install.
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