Pretty sophisticated attack vector: low voltage attack on AMD secure execution environment during boot. I wonder how many tries you need to get whatever bits you need in the right place. Also, I imagine you only need to cut 12V wires to do this, but I admire the willingness to get in there direct on these systems. I'd be a little nervous to make those cuts personally. Buried in the article is the claim that this will…
For the Xbox 360, the "Reset Glitch Hack" (which worked similarly) would just try over and over again until it got it right. A computer is happy to try tens or hundreds of times on your behalf.