https://devzone.nordicsemi.com/f/nordic-q-a/56119/dfu-stuck-in-reading-dfu-version-numberSDK 8.0 softdevice v8.0.0 dfu version 0.6 nrf51802 DFU log： 2020-01-02 17:26:09.400 25936-26422/? I/ (DfuBaseService.java:1342) connect:[Connecting to the device...] 2020-01-02 17:26:09.564 25936-25954/? I/ (DfuBaseService.java:733) onConnectionStateChangeen-USTelligent Community 13Tue, 07 Jan 2020 13:29:12 GMThttps://devzone.nordicsemi.com/thread/227905?ContentTypeID=1Tue, 07 Jan 2020 13:29:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5c620eb7-21c8-471f-ab01-afd5e183e781bjorn-spockeli<p>Hi Haorenpingan,</p> <p>could you attach a on-air trace of the communication between the Android 10 device and the nRF51802? You can use a nRF52 DK with the <a href="https://www.nordicsemi.com/Software-and-tools/Development-Tools/nRF-Sniffer-for-Bluetooth-LE/Download#infotabs">nRF Sniffer</a> plugin for Wireshark to capture the trace. I recommend using the latest version, i.e. v3.0.0.</p> <p>Are you using a Nordic Android mobile app, i.e. nRF Toolbox or nRF Connect? Or is it a custom app that uses the Nordic Android DFU library?</p> <p>Best regards</p> <p>Bjørn</p><div style="clear:both;"></div>