https://devzone.nordicsemi.com/f/nordic-q-a/60759/debugger-optionsI&#39;ve got an nRF52840 dev kit and am building my code using the app_ble_hrs_freertos project as a starting point. I&#39;m building the .elf file, which I load into Ozone to do debugging. I&#39;m able to flash the program using Ozone. I can single-step throughen-USTelligent Community 13Mon, 27 Apr 2020 19:56:43 GMThttps://devzone.nordicsemi.com/thread/246939?ContentTypeID=1Mon, 27 Apr 2020 19:56:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:afcd0e61-30cb-44b1-81db-cf959acb2294awneil[quote userid="7828" url="~/f/nordic-q-a/60759/debugger-options"]What do I need to do to get Ozone debugging to work[/quote] <p>It&#39;s nothing specifically to do with Ozone.</p> <p>It&#39;s the fact that halting the processor causes the BLE stack to miss timing deadlines, and crash.</p> <p>You need Monitor Mode Debug:</p> <p><a href="https://devzone.nordicsemi.com/f/nordic-q-a/48647/ble-debugging-on-nrf52/193088#193088">devzone.nordicsemi.com/.../193088</a></p><div style="clear:both;"></div>