Toyota reprogramming and security key

Recently, I have received numerous questions from forum members, and my friends are also facing significant challenges with their Toyota vehicles after replacing a new ECU, as the car fails to start. They are not familiar with Toyota ECU Flash Reprogramming and EUC Security Key. That’s why today, I will touch upon this topic to help you all gain a better understanding of Toyota. I sincerely hope that this discussion can be of assistance to many people.