> He did that by connecting oscyloscops to all chip's outputs and started with applying random current on inputs

This is absolutely not how reverse engineering a digital logic ASIC works.

Either the story got embellished through retellings, or this person was a fantasist.

There are people who hack on GPUs but it’s done at the software level.

I did get a kick out of imagining a scene where someone is trying to connect an oscilloscope to a circuit board to reverse engineer the CPU opcodes. That’s like the CSI: Miami version of what this would look like.