Lincoln Repair Questions? Ask a Mechanic for Answers ASAP
It is possible your battery voltage dropped to a low point while doing this update.
It is wise to a battery maintainer connected to the Battery while doing any updating or programming.
Did your update work ok?
Does the battery still appear to be ok, bright headlights etc?
Sounds like the immobilizer is not recognizing your key.
Have you got another key to try?
The key has two functions, one is remote access, one is to allow vehicle start.
Are you able to disconnect the battery for 2 minutes and then retry?
Do you need any further help?
I hope my advice has been of assistance to you.