https://devzone.nordicsemi.com/f/nordic-q-a/46356/device-not-run-after-executed-make-flashDevelopment software: 1. SDK 12.3.0 2. 51822 module 3. GCC Computer platform： 1. OSX Hardware version: 51822AA Description： I used the original hex in the sdk example to burn to the module, the module can run. but the hex complied byen-USTelligent Community 13Wed, 24 Apr 2019 05:27:14 GMThttps://devzone.nordicsemi.com/thread/183295?ContentTypeID=1Wed, 24 Apr 2019 05:27:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:30e8643b-b838-441b-85b0-20ca12d0e3e1Vidar Berg<p>Hello,</p> <p>The pre-compiled hex is merged with the Softdevice (Nordic Bluetooth stack). That&#39;s why it&#39;s larger.&nbsp;You can use the flash_softdevice target to program the Softdevice: make flash_softdevice &amp;&amp; make flash.&nbsp;</p> <p>Also, if you are using the xxAA variant with 16K of RAM, you need to adjust the RAM size in the linker script. The examples are configured for xxAC by default which has 32K of RAM.&nbsp;&nbsp;</p><div style="clear:both;"></div>