https://devzone.nordicsemi.com/f/nordic-q-a/25168/led1-2-3-4-are-onI am running example: nrf5-ble-tutorial-advertising on a nRF52-DK. with SDK 11 and s132_nrf52_2.0.0 softdevice. When I flash the code to the nRF52-DK, LED1, LED2, LED3 and LED4 are ON. My Main.c code is: /** @file * * @defgroup ble_sdk_app_template_mainen-USTelligent Community 13Thu, 14 Sep 2017 09:28:39 GMThttps://devzone.nordicsemi.com/thread/99156?ContentTypeID=1Thu, 14 Sep 2017 09:28:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4d9856b4-752d-4abd-9880-1a6e4a444215J&#248;rgen Holmefjord<p>Hi,</p> <p>This is most likely caused by an error code, causing your application to end up in the error handler. Make sure you are checking error codes from all function calls, and use <a href="https://devzone.nordicsemi.com/question/60125/my-device-is-freezing-and-restarting/">this method</a> to see where the error is occurring.</p> <p>Best regards,</p> <p>Jørgen</p><div style="clear:both;"></div>