https://devzone.nordicsemi.com/f/nordic-q-a/79482/secure-dfu-resume-updateI&#39;m implementing a DFU controller for the secure DFU bootloader documented here . There is an edge-case I&#39;m hitting that I&#39;d like some clarification on. As per the documentation, after issuing a select command (06 02) and receiving max_size offset anden-USTelligent Community 13Fri, 10 Sep 2021 10:03:11 GMThttps://devzone.nordicsemi.com/thread/328981?ContentTypeID=1Fri, 10 Sep 2021 10:03:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:62ae1304-b9fc-49ad-83c1-95d9115f347dovrebekk<p>Hi</p> <p>Hard to say what the issue is here. It could be that calling the execute command twice one the same object can cause an issue, but looking at the code it is not obvious that this should be problematic.&nbsp;</p> <p>Are you able to run the debug bootloader and enable the RTT log?</p> <p>Then you could get some logging information from the debugger that might be helpful in tracking down the issue.&nbsp;</p> <p>Best regards<br />Torbjørn</p><div style="clear:both;"></div>