https://devzone.nordicsemi.com/f/nordic-q-a/8861/problem-with-beacon-demo-appHi all! I am using the nRF51 DK and I am trying to use the elements demo APPs that Nordic provide - the Beacon app. after the downloading of the app and watching it working (Led 1 is blinking and through the android-nordic app I can see the device, theen-USTelligent Community 13Mon, 24 Aug 2015 10:47:20 GMThttps://devzone.nordicsemi.com/thread/32584?ContentTypeID=1Mon, 24 Aug 2015 10:47:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9f45bd8e-35da-4299-98a5-84b52132ddc0Hung Bui<p>@Yaron: It&#39;s not possible to re-write any data in flash, you need to erase the page first. And for UICR the only way to erase it is to erase the whole chip. Please have a look <a href="https://devzone.nordicsemi.com/question/38531/can-i-write-to-the-uicr-registers-with-a-segger-and-jlink/">here</a>.</p><div style="clear:both;"></div>