Immobilizer activated

My son's car had a bad ECU. The car could run with it but not properly. So he bought a used ECU and replaced the original. The problem is that the immobilizer, now, doesn't let the car start with either ECU.

Is there a way to reset or deactivate the the immobilizer?

Thank you

I forgot to mention that the car is an 99 Honda Prelude


My son's car had a bad ECU. The car could run with it but not properly. So he bought a used ECU and replaced the original. The problem is that the immobilizer, now, doesn't let the car start with either ECU.

Is there a way to reset or deactivate the the immobilizer?

Thank you

I believe there are bypass kits available online.