baby's first UART root shell; the Technicolour DJA0231 (Gen2 Smart Modem)

&#xA; recently i&rsquo;ve been diving into the rather intimidating but endlessly fascinating world of hardware hacking, and after a few aliexpress orders and bad financial decisions, I now have some of the tools required to start to poke around under the physical and digital hoods of electronic devices. &#xA; and why not start with my battle-tested, age-old Telstra Gen 2 &ldquo;Smart Modem&rdquo;?…