https://devzone.nordicsemi.com/f/nordic-q-a/118650/invalidheadermagic-when-using-ios-nrf-connect-device-managerI am trying to update my firmware using IOS-nRF-Connect-Device-Manager and am getting an invalidHeaderMagic error when calling: I am using version 1.7.3 (last version to still support Swift5) and read this issue and resolution stating: So the &#39;invaliden-USTelligent Community 13Sun, 09 Feb 2025 12:31:08 GMThttps://devzone.nordicsemi.com/thread/522103?ContentTypeID=1Sun, 09 Feb 2025 12:31:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fd984157-1e60-4d5c-815e-d85481d12fd8lcj<p>I was and it turns out the problem was downloading/authentication and not the upgrade. I got it working. I really appreciate your help. It was that I was using the download function so I was getting a file. I checked the file size and it was 10% of the file. It doesn&#39;t throw an error so I was confused, but checking the response I saw there was an error code.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/521780?ContentTypeID=1Thu, 06 Feb 2025 15:33:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:89769d1f-dbdc-49ea-8aaf-f54d0ef4d877Einar Thorsrud<p>Hi,</p> <p>Have you been able to test with the <a href="https://www.nordicsemi.com/Products/Development-tools/nRF-Connect-Device-Manager">Device Manger app</a>? Does that work (this way we can try to isolate the issue to your app and not the bootloader or file you use to update).</p><div style="clear:both;"></div>