Q: New key not recognized

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Somebody tried to break into my car which resulted in me having to get a new ignition cylinder, now that it's replaced when I go to start it I get the message that my starter is disabled due to anti theft systems... I am not sure how to bypass or fix this issue. My new key is cut and I have done the 10 minutes in the on position and 5 seconds in the off, repeat 3 times. Still nothing.

My car has 216000 miles.
My car has an automatic transmission.

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