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J5 looks like a UART connector and the JT_ pins are likely JTAG. UART should give you console access to manufacturing/diagnostic commands, and JTAG should allow you to the debug the code (firmware) running on the controller CPU. As for J3, at a guess, ROM/FW allows you to switch from the firmware stored in the flash to the built-in CPU boot ROM (e.g. in ...

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