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it will ask if you want to replace it, then you answer yes.
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Save this file, go back to the contents of the Boot Camp Assistant and drag the newly edited file into. In my case I changed from Macbook7,2 to MacBookPro8,2. If it is like PreUSBBootSupportedModels, change the name to USBBootSupportedModels, expand this line and at the item0, edit and write down your MacBook model as a string value. Open this ist file with a plist file editor or xcode, then look for a line saying "USBBootSupportedModels". Then find the file ist and drag and drop to a whatever folder you created before. go to your application>utilities, select the Boot Camp Assistant app, right click > show packages content. So, for those who can't create the USB install disk, here some tip.
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