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I followed this tutor here and got success: https://www.youtube.com/watch?v=hE8If6gabUI. EDITED: the "Create a Windows 7 install disk" option is hidden coz of your system had limited some conditions/environments. So all you have to do is "add" them by editing bootcamp's "info.plist" file:

1. Open Package content of Boot Camp Assistant app, backup Info.plist file somewhere, then open the old one with XCode.
2. Edit file:
   • Edit section's title: PreUSBSupportedModels to USBSupportedModels (if it's already USBSupportedModels -> skip this step)
   • Add your System's model identifier(Find it by System Information app) into USBSupportedModels section.
   • Add your Boot ROM version (Find by System Information app) to DARequiredROMVersions section
   • Save.
3. Restart BootCamp

NOTE: a comment of @dusanvf "If your Bootcamp crashes after this, write this into terminal sudo codesign -fs - /Applications/Utilities/Boot\ Camp\ Assistant.app/"