https://devzone.nordicsemi.com/f/nordic-q-a/57851/52840-center-dfu-without-sd-ble-but-use-uart-rx-tx-onlyhello. 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 cellphoneen-USTelligent Community 13Tue, 18 Feb 2020 07:31:41 GMThttps://devzone.nordicsemi.com/thread/234785?ContentTypeID=1Tue, 18 Feb 2020 07:31:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5e8aab2c-b013-4454-b7cb-fd4d90c1fcdbVidar Berg<p>Hello,</p> <p>We do have support for serial DFU over UART. Please take a look at the SDK documentation here:&nbsp;<a title="DFU protocol" href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v16.0.0/lib_dfu_transport.html?cp=7_1_3_5_2">DFU protocol</a>&nbsp;and also this blog post&nbsp;<a href="https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/getting-started-with-nordics-secure-dfu-bootloader">https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/getting-started-with-nordics-secure-dfu-bootloader</a>&nbsp;to get started.&nbsp;</p><div style="clear:both;"></div>