https://devzone.nordicsemi.com/f/nordic-q-a/73133/build-failed-with-sdk-v12-3-0-in-sesHello, I am using MacBook and would like to import Keil Projects into Segger Embedded Studio by following this guide , but finally I got an error is that I have found other related solutions like this link and this link , but it couldn&#39;t help. en-USTelligent Community 13Tue, 23 Mar 2021 10:35:41 GMThttps://devzone.nordicsemi.com/thread/301382?ContentTypeID=1Tue, 23 Mar 2021 10:35:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:82eee083-d454-4b55-838a-e1acb0517dd8awneil<p>Note that nRF51 are not (and have not been for several years) recommended for new BLE designs:</p> <p><a href="https://devzone.nordicsemi.com/f/nordic-q-a/42960/status-of-nrf51-products/169728#169728">https://devzone.nordicsemi.com/f/nordic-q-a/42960/status-of-nrf51-products/169728#169728</a></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/301374?ContentTypeID=1Tue, 23 Mar 2021 10:23:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:be172056-1feb-432d-81ff-ec782bb95a0bjoycel<p>I am already choosing internal toolchain by following the guide mentioned above.</p> <p>Now I found that use&nbsp;<code>.syntax unified&nbsp;</code>than it works now, thanks!</p> <p>However, I found that nRF51822 evaluation board is PCA10001. Can I edit some configs like <a href="https://github.com/knuta/nrf-pca10028-to-pca10001">this</a>&nbsp;so&nbsp;that SDK 12.3.0 can runs on that board?</p> <p><code></code></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/301369?ContentTypeID=1Tue, 23 Mar 2021 10:06:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3be601c9-6a83-412f-b128-8198f113ce11awneil<p>Keil uses ARM&#39;s own toolchain - including assembler.</p> <p>Segger use the GCC toolchain - the GCC assembler is not the same as the ARM assembler.</p><div style="clear:both;"></div>