https://devzone.nordicsemi.com/f/nordic-q-a/61880/dfu-issueHi, I have 10 custom boards with the nRF52840 chip. 9 boards of them perform the DFU successfully. And just one board fails with it, All the boards have the same bootloader and the same application !. Below is a screen shot from the mobile deviceen-USTelligent Community 13Thu, 01 Oct 2020 05:08:01 GMThttps://devzone.nordicsemi.com/thread/272403?ContentTypeID=1Thu, 01 Oct 2020 05:08:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:145eba3c-7897-4144-b560-2a5a91f57068jawadk<p>Hi,</p> <p></p> <p>The board who had the DFU issue had an error with it&#39;s&nbsp;oscillator.</p> <p>This is the cause of the problem.</p> <p>BR</p> <p>JK</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/252213?ContentTypeID=1Thu, 28 May 2020 13:37:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:22954ede-09f9-46a2-907a-32bed68e033dEinar Thorsrud<p>Hi JK,</p> <p>That was odd. Does it always fail in the same way on this board, and not the others? Are you using DFU with or without bonds?</p> <p>Can you share the full log from the phone (text rather than a screenshot)? Also, a log from the bootloader when using the _debug bootloader with RT logging could be useful.</p> <p>Einar</p><div style="clear:both;"></div>