https://devzone.nordicsemi.com/f/nordic-q-a/81999/dfu-controller-firmware-data-object-crc-computationHi, I&#39;m trying to create a DFU controller on a secondary board, and have been referencing the info center and nrf toolbox android app to get started. I&#39;ve run into an issue where the dfu controller does not compute the same CRC as the app/dfu targeten-USTelligent Community 13Tue, 23 Nov 2021 16:37:16 GMThttps://devzone.nordicsemi.com/thread/340415?ContentTypeID=1Tue, 23 Nov 2021 16:37:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4836a9f5-3567-499b-aa5c-36f53599f9c0kurtovic<p>All right that solved it, I overlooked that bit with the third parameter thinking it was a polynomial. Thank you</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/340360?ContentTypeID=1Tue, 23 Nov 2021 13:50:42 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d8a1efa6-ff17-4259-b5b3-3e2f1a24f0b5Amanda Hsieh<p>Hi,&nbsp;</p> <p><span>The CRC is always computed from offset 0 (i.e. first data object). You&nbsp;must include the previous CRC when computing the next. The function&nbsp;<a title="Software Development Kit" href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/group__crc32.html?resultof=%22%63%72%63%33%32%5f%63%6f%6d%70%75%74%65%22%20">CRC32 compute</a>()&nbsp;is the API we use in our SDK. Notice we have a third optional input parameter that lets you continue CRC computation from a previous checksum.<br /></span></p> <p><span>Regards,<br />Amadna</span></p><div style="clear:both;"></div>