https://devzone.nordicsemi.com/f/nordic-q-a/66275/develop-nrf52-dk-with-iarWhen I used IAR to debug the routine with BLE in NRF52-DK, the program could not run to main after downloading to the chip (J-Flash had burned softdevice S132 previously), my IAR version was 8.5, I found that the programming algorithm pointed to NRF52832en-USTelligent Community 13Wed, 23 Sep 2020 11:38:18 GMThttps://devzone.nordicsemi.com/thread/271060?ContentTypeID=1Wed, 23 Sep 2020 11:38:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6c61b587-738b-4822-9e14-dfebfb8e6c89Vidar Berg<p>Hello,</p> <p>There are some projects that will not work out of the box with&nbsp; IAR 8, please refer to the &quot;note for IAR 8 users&quot; in the SDK&nbsp;<a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.2/index.html">release notes</a> for details. You should also make sure you to install the IAR MDK package which is available for download here: <a href="https://www.nordicsemi.com/Software-and-tools/Development-Tools/nRF-MDK/Download">https://www.nordicsemi.com/Software-and-tools/Development-Tools/nRF-MDK/Download</a></p> [quote user=""]When I used IAR to debug the routine with BLE in NRF52-DK, the program could not run to main after downloading to the chip[/quote] <p>&nbsp;Could you post a screenshot of the CPU registers when this happens?</p><div style="clear:both;"></div>