# 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