https://devzone.nordicsemi.com/f/nordic-q-a/7494/power-fail-nvmc-protectionIn the nrf51 series reference manual section 12.1.9 it states that there is hardware protection that prevents write instructions from being executed and that there is more information in the NVMC chapter. I read through that chapter and found no informationen-USTelligent Community 13Tue, 14 Nov 2017 10:43:53 GMT