https://devzone.nordicsemi.com/f/nordic-q-a/60537/how-to-get-a-signature-less-bootloader-from-example-bootloadersHi I would like to know what the easiest way to get a signature-less bootloader from your DFU bootloader examples. For me it looks as if the open_bootloader is not very different to the secure_bootloader and it&#39;s not really open since it also uses encryptionen-USTelligent Community 13Thu, 23 Apr 2020 14:17:57 GMThttps://devzone.nordicsemi.com/thread/246298?ContentTypeID=1Thu, 23 Apr 2020 14:17:57 GMT137ad170-7792-4731-bb38-c0d22fbe4515:09f5bbd0-78e5-464e-b6ab-db3b07ebb6e3Einar Thorsrud<p>Hi,</p> <p>The SDK does not provide any bootloader without support for signature verification. However, the Open bootloader only uses signature verification for bootloader updates, and not for application or SoftDevice updates.&nbsp;This is controlled by the&nbsp;NRF_DFU_REQUIRE_SIGNED_APP_UPDATE macro, which is used&nbsp;by&nbsp;signature_required() in&nbsp;components\libraries\bootloader\dfu\nrf_dfu_validation.c. You could simply modify&nbsp;signature_required() to always return false. With this modification, no crypto libraries are actually used, but we do not have any ready-made projects where they do not exist. You would have to remove unused code yourself (or live with it being there unused).</p><div style="clear:both;"></div>