https://devzone.nordicsemi.com/f/nordic-q-a/38719/dfu-update-in-sdk15-00Hi i am using SDK15.0 .i have tested Secure Ble for firmware update. Its working with my public keys. i want to know is it possible to update firmware without Public key and .pem file in SDK 15.0..if it means ,please tell me the procedure. i haveen-USTelligent Community 13Fri, 21 Sep 2018 04:57:30 GMThttps://devzone.nordicsemi.com/thread/149727?ContentTypeID=1Fri, 21 Sep 2018 04:57:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b3eb484a-c9be-48c8-903f-840b9d14982drajis<p>thanks for your reply</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/149657?ContentTypeID=1Thu, 20 Sep 2018 13:28:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:de88e430-9ecd-4063-b1cb-12a72d382a20Sigurd[quote userid="73301" url="~/f/nordic-q-a/38719/dfu-update-in-sdk15-00"] i want to know is it possible to update firmware without Public key and .pem file&nbsp; in SDK 15.0..if it means ,please tell me the procedure.[/quote] <p>No, this is not supported by the secure BLE bootloader. Signing of the firmware is a&nbsp;<span>crucial&nbsp;part of the bootloader, and you will need to use the key to create the init package with the new&nbsp;firmware image. Security is important, and I recommend using the secure bootloader.</span></p><div style="clear:both;"></div>