https://devzone.nordicsemi.com/f/nordic-q-a/38453/crc-errorHello, I integrated your firmware (iOSDFULibrary) in our project but I got error when I tried to make the DFU to our Nordic device. Error : Error raised when the CRC reported by the remote device does not match. Service has done 3 tries to send theen-USTelligent Community 13Thu, 13 Sep 2018 11:56:56 GMThttps://devzone.nordicsemi.com/thread/148608?ContentTypeID=1Thu, 13 Sep 2018 11:56:56 GMT137ad170-7792-4731-bb38-c0d22fbe4515:50d0af64-6510-48a8-9e5b-22b7996fe822Sihem MOHAMED<p>Thanks for your help, I used the same logic as the firmware&#39;s&nbsp;example when I set the&nbsp;packetReceiptNotificationParameter = 12 for&nbsp;DFUServiceInitiator it worked</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/148551?ContentTypeID=1Thu, 13 Sep 2018 08:42:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8ae3d456-390f-4f69-860a-a55ddb06a3d9Vidar Berg<p>Thanks for confirming, so the problem is most likely in the iOS app then. With iPhone 6s, does it fail consistently, and does it happen at the beginning of the transfer? Can you provide the complete debug log from your app?&nbsp;&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/148439?ContentTypeID=1Wed, 12 Sep 2018 13:46:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6bf0efbb-4818-430a-9932-4ca781cefa88Sihem MOHAMED<p>yes I can make DFU with nrf connect on iPhone 6s (iOS 11.4) and the bootloader is based on SDK 14&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/148386?ContentTypeID=1Wed, 12 Sep 2018 11:28:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6f37168d-20de-4321-a678-7e8da920b5dbVidar Berg<p>Hello,</p> <p>To narrow down the problem, please try to upload the same dfu package with nrf connect / nrf toolbox on iPhone 6s. Do you know what SDK version the bootloader is based on?&nbsp;&nbsp;</p><div style="clear:both;"></div>