https://devzone.nordicsemi.com/f/nordic-q-a/85481/nrf52840-ram-adjustment-causes-hard-lockHi all, I&#39;m experiencing a weird behaviour when adding NUS BLE profile to a standard BLE Peripheral HRS example. The code compiles fine without any error or warning, and it&#39;s expected that the RAM starting point should be adjusted once SoftDeviceen-USTelligent Community 13Mon, 07 Mar 2022 13:05:20 GMThttps://devzone.nordicsemi.com/thread/356600?ContentTypeID=1Mon, 07 Mar 2022 13:05:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a7aac3bb-edd4-4348-bc77-476a810942adKenneth<p>Not seen anyting like this before, what happens if you go back to the default example without any modifications and only change to&nbsp;RAM_START=0x20002be0 and&nbsp;RAM_SIZE=0x3d420? (You should get a warning, but it should work.)</p> <p>Maybe double check the nRF5 SDK release_notes.txt and check if you are using the correct toolchain for that release? Also, make sure you are using the latest nRF5 SDK.</p> <p>Kenneth</p><div style="clear:both;"></div>