How to unlock my radio after replacing the auxilary battery in the trunk

What is your question?

I recently replaced my auxilary battery in the trunk of my car.now the radio is giving me a msg device not available.how do I get my command center back up and running again.do I need a special tool or does it need to be reprogrammed.

What makes this problem better or worse?

My radio stopped working and. the command nob is not working properly.