Need Pass-code for techstream !please help

Prius 2013 gen 3 around 150k miles . If someone could guide me or help me. I’ve been on a non stop grind trying to figure out what the problem is in the car is now chatGBT is telling me it’s the ecu I swapped it out and chatGBT said it was correct that was the problem now I just need to connect it to the new key fob but before I do that I need to do a smart code reset because my power management control doesn’t recognize it since I swapped it . If someone has a website or something trustworthy I can use that’d be great!