52840 center dfu without sd/ble, but use uart(RX TX) only.

hello.

      I used 52840 act as center device.whose RX TX connected to my another MCU(MTK7688 UART). This is a IoT-GateWay. now I want to upgrade the 52840 application. BUT, I can not find how to do.because you give methods that only about using cellphone app. what can I do next? thanks.

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