Hey @Pax - Do you want to start over from the first node arbitrarily, or do you just want the AI to go back to the start node after hitting the end of the patrol?
If you want to start from the end of the patrol, just switch the Loop Type on your BT node to Loop instead of Ping Pong.
If you actually want to reset the behavior tree and force it to reload, then follow Aaron’s advice, but call AIInit directly on the Mind, not on the AI.
AI.Mind.AIInit();