https://devzone.nordicsemi.com/f/nordic-q-a/117893/nrf9160-custom-modem-updater-calculated-sha256-of-modem-firmware-differs-from-digest-txt-fileHi, I&#39;m working on implementing a modem upload feature (using probe-rs) to be integrated into our production programming line. Following the procedure described here ( docs.nordicsemi.com/.../device_setup.html) all seems to go well, but when calculatingen-USTelligent Community 13Thu, 09 Jan 2025 15:34:33 GMThttps://devzone.nordicsemi.com/thread/517763?ContentTypeID=1Thu, 09 Jan 2025 15:34:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4c1195f5-0d36-4c43-9784-6706475c7d11dejans<p>Hi,<br /><br />There is&nbsp;<a href="https://docs.nordicsemi.com/bundle/nrfxlib-apis-latest/page/group_nrf_modem_bootloader_ga436e4efba426a6238a2120ab2a18a186.html#ga436e4efba426a6238a2120ab2a18a186">nrf_modem_bootloader_digest()</a>&nbsp;function (from&nbsp;<a href="https://docs.nordicsemi.com/bundle/nrfxlib-apis-latest/page/group_nrf_modem_bootloader.html">bootloader API</a>) which should be used for reading digest hash data from the modem.<br /><br />Best regards,<br />Dejan</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/517679?ContentTypeID=1Thu, 09 Jan 2025 12:15:50 GMT137ad170-7792-4731-bb38-c0d22fbe4515:eeac267c-187c-4bb1-ab0a-a9330540dc3drogierl<p>Ok.. comment to self:</p> <p>What I suspect is going on is that the input hex files (from the zip archive) are encrypted and the given SHA256 hashes (in the digest.txt) are the digests of the non-encrypted data.. In other words, only the modem firmware itself can calculate the correct digest over the decoded/decrypted firmware image segments. Doh.</p> <p><br />Does this&nbsp;make sense..?</p> <p>In essence this comes down to just RTFM..&nbsp;<span class="emoticon" data-url="https://devzone.nordicsemi.com/cfs-file/__key/system/emoji/1f601.svg" title="Grin">&#x1f601;</span></p><div style="clear:both;"></div>