# Extra insurance against accidental iOS firmware updates.
# Make sure you're on iTunes 10.2 or 10.2.1 first!
# From Terminal.app and with iTunes closed, run this command:
defaults write com.apple.iTunes personalized-installation-server-host /dev/null
# If you actually DO want to update, and you're really sure about it, then undo that with:
# defaults delete com.apple.iTunes personalized-installation-server-host