In the original story, Ultron had been a flawed AI that Tony rushed out in an extremely short time, driven by fear.
When Tony passed through the Wormhole, he saw Thanos's army. Then, under the provocation of Scarlet Witch Wanda, his fear was magnified many times over, ultimately giving him the idea of using AI-managed armored robots to arm all humanity.
By chance, he found the key to a technological breakthrough in the Mind Stone. So he pulled Bruce Banner in, and the two of them created Ultron in just three days.
But now... none of those conditions existed. Tony might have been afraid, but he hadn't been the only one to pass through the Wormhole this time. Leaving Harry aside, wasn't Norman serving as president perfectly normally?
Second, Scarlet Witch hadn't grabbed his head and scared him, and he had been given plenty of time to study the data within the Mind Stone.
Lastly, the research lineup had been nothing short of luxurious. The people involved weren't limited to "superheroes," and their approach would have been more levelheaded as well. In the end, they found a way to create AL and even upgraded Jarvis.
Harry didn't think Tony would still go back and create some "Ultron."
So where exactly had this "Ultron" come from?
In the footage, a battered robot went on a rampage through the streets, but it was quickly defeated by the mechanized city police.
Then, in the next instant, the patrol robots' indicator lights turned red. That meant their core programs had been altered. Sure enough, the patrol robots raised their guns at the people around them—
"Humans can't protect themselves. These puppets can't protect you either."
It was an Electronic Virus. Fortunately, Osborn Group products all had Hardware Locks, so there was only so much