https://devzone.nordicsemi.com/f/nordic-q-a/35085/not-compile-successfully-sdk-exampleI using Keil for open_bootloader example but i can&#39;t compile it because some error. Could anyone help me? Thanksen-USTelligent Community 13Tue, 05 Jun 2018 09:09:18 GMThttps://devzone.nordicsemi.com/thread/134687?ContentTypeID=1Tue, 05 Jun 2018 09:09:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2311188c-969a-4f24-bf82-2e3a4013380eBj&#248;rn Kvaale<p>I believe <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.0.0/sdk_app_serial_dfu_bootloader.html?cp=4_0_0_4_3_4_2#serial_sdk_app_dfu_bootloader_test">the test setup</a> is quite similar to the secure dfu bootloader over serial link, as both use the usb cdc acm dfu transport. Could you try testing with this setup (steps 1-3) &amp; see if that works? It might be that you forgot to install micro-ecc maybe. What nrfutil command did you use to generate your public key? Was it similar to this:&nbsp;</p> <p>nrfutil keys display --key pk --format code c:\vault\priv.pem --out_file public_key.c?</p><div style="clear:both;"></div>