https://devzone.nordicsemi.com/f/nordic-q-a/34556/i-have-a-question-with-flash-writing-of-nrf-52Once written, you can not write it for the second time. It will not cause an error, but is there any way? Write the source code below. NRF_FSTORAGE_DEF (nrf_fstorage_t fstorage) = { / * Set a handler for fstorage events. * / .evt_handler = fstorage_evt_handleren-USTelligent Community 13Tue, 22 May 2018 12:24:28 GMThttps://devzone.nordicsemi.com/thread/132758?ContentTypeID=1Tue, 22 May 2018 12:24:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6874752f-06b6-405c-9d22-14cd7114fda2Kenneth<p>Hi, for all flash storage you can only write bits to &#39;0&#39;, not &#39;1&#39;. This means that you can write to a flash page multiple times, however if you need to change any bits from &#39;0&#39; to &#39;1&#39;, then you need to erase the entire flash page before writing updated data to the flash page, in such case you also need to temporary buffer other data in the flash page before writing them back.</p><div style="clear:both;"></div>