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I only understood half of what I posted above but I can confirm it works.
Holding the power button + volume down + the Qualcomm cable button on boot (or before rebooting) brings the device in Emergency Download Mode (EDL). So, in case of a brick you don't need to open the device.
Now that we know the ways to access EDL, we just need to find a loader so we can read/write to it.
I'll test UART tomorrow.
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