Zero Day Initiative - Looking at the Attack Surfaces of the Pioneer DMH-WT7600NEX IVI
Briefly

The primary challenge with extracting the software from the Pioneer DMH-WT7600NEX was overcoming various barriers, including encrypted software updates and the risks associated with desoldering the eMMC chip.
Researchers focused on extracting the eMMC contents in-system, using labeled test points on the board for connections and employing a 220 Ohm resistor to hold the SoC in reset.
Read at Zero Day Initiative
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