How to fool Bootcamp assistant and install Windows from an USB drive

I’m running Mavericks (10.9) on a mbp version 6,1 and Bootcamp assistant doesn’t let me create install windows from an USB drive.

Here’s how to fix it:

1. Locate Boot Camp Assistant.app in /Applications/Utilities folder and backup it somewhere
2. Right click the copy in Utilities folder and click on Show package contents.
3. Locate Info.plist file and open it with a text editor
4. Locate the tag “PreUSBBootSupportedModels” and change its name in “USBBootSupportedModels” (just remove “Pre”)
5. Save that plist, it will require you to authenticate as administrator
6. Now you should be fine if you’re running a system older than Mavericks.
   If you’re running Mavericks you need to replace existing app signature as an extra step, otherwise Bootcamp assistant will close unexpectedly:
   1. Open the terminal and type “sudo codesign -fs — /Applications/Utilities/Boot\ Camp\ Assistant.app”
   2. The command will print out “Boot Camp Assistant.app: replacing existing signature” then quit.
7. Now your assistant should display a new “Create a Windows 7 install disk” option