https://devzone.nordicsemi.com/f/nordic-q-a/13012/update-advertisement-data-with-the-help-of-radio-notificationHi! We are using ble_radio_notification for changing the advertisement data after every advertisement. The problem is that it doesn&#39;t work, the device freezes when trying to do this. Here are some code snippets that might give you a better understandingen-USTelligent Community 13Wed, 06 Apr 2016 08:51:08 GMThttps://devzone.nordicsemi.com/thread/49593?ContentTypeID=1Wed, 06 Apr 2016 08:51:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2d40d4a6-e874-4ab6-ba6b-8a2b93ff4d41Kristoffer Hilmersson<p>Thanks alot!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/49592?ContentTypeID=1Wed, 06 Apr 2016 08:47:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:01a43cf3-c9b8-4779-ab2e-20ae052c7a8cEinar Thorsrud<p>You cannot make sd_* SVC calls from a priority that is higher than the lowest SoftDevice priority. As long as the radio notification IRQ priority is set to <code>APP_IRQ_PRIORITY_LOW</code> you should be good. For nRF51 <code>APP_IRQ_PRIORITY_LOW</code> is set to 3, as you write. However, nRF52 have more priority levels, and <code>APP_IRQ_PRIORITY_LOW</code> is 6. If you have specified priority level 3 manually, you would have set a priority that is higher than the lowest SoftDevice priority, which will lead to a hard fault. You can see the details in components/libraries/util/app_util_platform.h.</p><div style="clear:both;"></div>