https://devzone.nordicsemi.com/f/nordic-q-a/31084/suggestion-for-update-to-sdk-uicr-read-back-protection-enabled-by-preprocessor-flagHi, I added this in SystemInit() (just below the CONFIG_NFCT_PINS_AS_GPIOS section) within system_nrf.c so that I could easily turn on or off the APPROTECT read back protection when switching between my debug and release builds. Hope this helpsen-USTelligent Community 13Tue, 06 Mar 2018 14:35:02 GMThttps://devzone.nordicsemi.com/thread/123099?ContentTypeID=1Tue, 06 Mar 2018 14:35:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f1e5167a-2d81-410a-8a32-324f915b5268Bj&#248;rn Kvaale<p>Great! Thanks for the suggestion!</p><div style="clear:both;"></div>