https://devzone.nordicsemi.com/f/nordic-q-a/55835/dfu-customizingHello. I&#39;m doing a DFU customization now. However, because of the problem of data transmission of the last packet of the first page when advertising, connection and nRF connection data is transmitted, why is that why the crc is not correct?en-USTelligent Community 13Tue, 07 Jan 2020 08:27:05 GMThttps://devzone.nordicsemi.com/thread/227811?ContentTypeID=1Tue, 07 Jan 2020 08:27:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:adf16953-4d0f-4fa2-955f-102c3952863fkevin seo<p>hello.</p> <p>I solved the problem.</p> <p><span lang="en">Memory allocation was a problem.</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/226517?ContentTypeID=1Fri, 20 Dec 2019 09:59:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fca9f766-cb57-4993-884e-c32271cd6659Edvin<p>Hello,</p> <p>I don&#39;t understand exactly what you mean with this question.&nbsp;</p> <p>Did you try to follow <a href="https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/getting-started-with-nordics-secure-dfu-bootloader" rel="noopener noreferrer" target="_blank">this guide</a>?</p> <p>&nbsp;</p> [quote user=""]of the last packet of the first page when advertising[/quote] <p>&nbsp;Are you advertising or in a connection?</p> <p>&nbsp;</p> [quote user=""]why the crc is not correct?[/quote] <p>&nbsp;Do you mean the CRC of a packet on air, or the DFU image (the application that you transfer over DFU)?</p><div style="clear:both;"></div>