https://devzone.nordicsemi.com/f/nordic-q-a/19294/need-solution-for-solving-device-error-in-keilHi, While I&#39;m Flashing LED Blinking Example in nRF51822 Ek using Keil uVision 5 along with SDK v12.2.0 , Program is uploaded but LED is Continuously glowing without blinking i checked it twice but i did not get that and i found a cross mark circled withen-USTelligent Community 13Tue, 31 Jan 2017 09:11:21 GMThttps://devzone.nordicsemi.com/thread/74783?ContentTypeID=1Tue, 31 Jan 2017 09:11:21 GMT137ad170-7792-4731-bb38-c0d22fbe4515:534531e8-3bf7-4e3a-8754-f224d695d4c2satish<p>Thanks,I tried above steps and its working fine.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/74782?ContentTypeID=1Mon, 30 Jan 2017 08:57:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:46de796a-99f4-4c2f-a20a-5c733ba6655dSigurd<p>Hi,</p> <p>Try to right click on <code>arm_startup_nrf51.s</code> and <code>system_nrf51.c</code> , and click on Update Config File:</p> <p><img src="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/DeviceError2.png" alt="image description" /></p> <p>If the error is still there you need to update to the latest DeviceFamilyPack(See this <a href="https://devzone.nordicsemi.com/question/92473/error-symbol-in-system_nrf52c/">answer</a>.)</p><div style="clear:both;"></div>