https://devzone.nordicsemi.com/f/nordic-q-a/72124/trying-to-compile-ble-secure-dfu-bootloader-exampleHi I am trying to build the BLE Secure DFU Bootloader example using SDK 17.02 and the PCA10040 Dev board. Following various threads in the forum, I have been successful in downloading, building and adding the micro-ecc library to the project file. Ien-USTelligent Community 13Tue, 02 Mar 2021 12:24:55 GMThttps://devzone.nordicsemi.com/thread/297162?ContentTypeID=1Tue, 02 Mar 2021 12:24:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2473d317-5421-45c9-b7e6-4e5184cdff23Hung Bui<p>i Big Mike,&nbsp;<br />It seems that&nbsp;your sdk_config.h hasn&#39;t select&nbsp;NRF_CRYPTO_BACKEND_MICRO_ECC_ENABLED and&nbsp;NRF_CRYPTO_BACKEND_NRF_SW_ENABLED.&nbsp;</p> <p><span>g_nrf_crypto_ecc_secp256r1_curve_info is defined inside micro_ecc:backend_ecc.c , please double check.&nbsp;</span></p> <p><br />I attached here my project files, could you please try to put it into the SDK and compile&nbsp; ?&nbsp;</p> <p><a href="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/File.zip">devzone.nordicsemi.com/.../File.zip</a></p><div style="clear:both;"></div>