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Last time we have used JTAG and the st-utility to dump the firmware from the Ledger Nano S. In this video I want to setup the reversing environment and go over some basics. But before I want to go over a few general things. First using JTAG is not the only way to get the firmware. I mentioned in a previous video that I had the Ledger chrome app open, and it was dumping all the APDU commands sent to the device in the developer console. And so there we observed the commands where the firmware update was sent to the device. And you could just extract the firmware from these APUD commands. In fact that was how Thomas got the firmware originally, not through JTAG. And you can actually find these firmware update APDU commands hardcoded in the scala source code of that chrome app as well. Yes its scala. And yes the APDU commands are hardcoded. So for example this is the APDU command to select the memory address where to write the updated to. 8003000 Maybe you even remember this address, b