https://devzone.nordicsemi.com/f/nordic-q-a/28625/reading-and-writing-using-fstorageHi, I am using nrfsdk11 nrf52 and s132 soft device. In my code,I am doing this in main(); void fs_evt_handler(fs_evt_t const * const evt, fs_ret_t result) { if (result != FS_SUCCESS) { // bsp_indication_set(BSP_INDICATE_FATAL_ERROR); APP_ERROR_CHECKen-USTelligent Community 13Mon, 18 Dec 2017 13:49:54 GMThttps://devzone.nordicsemi.com/thread/113458?ContentTypeID=1Mon, 18 Dec 2017 13:49:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6ed28871-be55-414c-a128-58c34a665c9eJ&#248;rgen Holmefjord<ol> <li>If you set a breakpoint after the softdevice is enabled, the softdevice will assert when you continue execution, due to events not having been handled withing the required time. You will have to reset execution after a breakpoint if the softdevice is running.</li> <li>What is showing &quot;illegal qualifier&quot;?</li> </ol> <p>Have you looked at the fstorage examples in <a href="https://github.com/NordicPlayground/nRF5-flash-storage-examples">this GitHub repository</a>?</p><div style="clear:both;"></div>