E90 335i bricked after going to CA smog

Hi I'm posting for my uncle as he doesn't have reddit.

Recently, he took his E90 335i to get smogged. I think it has iDrive. He told me that after they plugged their scanner into the OBD2 his car stopped working. He's not able to get it to start. Originally, he sent it to his friend to get it fixed but its been a few weeks and they haven't made any progress. Thus, he wants to try to fix it on his own before he sends it out to the dealership.

Could you guys give any advice on what we should check for? I have a hunch that the ECU might be bricked but this is only because I had someone else tell me their story about how their E90 335i was also bricked from going to smog and they said the culprit was the ECU.

I might be leaving out necessary information, so please let me know if I need to mention or clarify on things

Thanks for your time.