03 How To Find The JTAG Interface Hardware Hacking Tutorial

In this video I will introduce the JTAG interface, an interface that you can find on almost all of your IoT devices like routers, webcams, electronic toys, TV remotes and so on. I will explain why this interface can be so useful in hardware hacking and how to find its position and pinout using simple techniques like, for example, using a multimeter or a cheap Jtagulator board. And when the pinout is known, but the JTAG interface is not working, I will explain the reasons why this can happen and what to do to solve the issue. What is the JTAG interface JTAG is an industry standard, usually implemented in complex integrated circuits; this standard was issued for the first time in 1990, with the purpose to simplify the testing of PCB after manufacture. It allowed controllability and observability of each bit of internal memory of each integrated circuit and allowed to check the integrity of each single trace connecting different integrated circuits in the PCB. It allows reading and writing the fla