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Dell XPS13 RAM Upgrade

I’d recently bought a new XPS13 7390 (non 2-in-1) laptop. I had bought the 8GB variant, how hard could it be to upgrade?

Dell release the same BIOS update for the XPS no matter what RAM is installed, so they use resistor straps on GPIO pins of the CPU to detect various mainboard variants. I think I had certainly nerd-snipped her at this point, because she went as far as decompiling the BIOS and extracting part numbers of all possible strap configurations, and deemed that only the values shown on the schematic were present. It was a good thing I practiced, because to overcome the multiple ground planes you really do need to pump a lot of heat into the PCB before the lead-free solder begins to melt.

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