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JTAG, short for Joint Test Action Group, is a method used for boundary scanning. Possibly applications are hardware testing/debugging and firmware flashing, including debricking of hardware which ended up in a defunct state.
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How do I extract the firmware from this bluetooth speaker board?
According to the datasheet, it seems that the ATS1815 chip doesn't have a JTag interface, so it seems that this interface is not available here. …