https://devzone.nordicsemi.com/f/nordic-q-a/4717/sdk-v6-0-dfu-of-bootloader-s310-softdevice-v2We have an early implementation of the v6 SDK DFU ported to support S310 on a handful of devices in the field and need to update them to a new bootloader and we&#39;d like to move to S310 SoftDevice v2 in the same update. I&#39;ve seen this post: devzone.nordicsemien-USTelligent Community 13Thu, 11 Dec 2014 07:43:14 GMThttps://devzone.nordicsemi.com/thread/16702?ContentTypeID=1Thu, 11 Dec 2014 07:43:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b10b074c-f042-4398-b602-7fead7c6b9d6Asbj&#248;rn<p>The first version of the S310 supported only updates of the application. Since then we have added a master boot record in the softdevice to enable customers to update both the softdevice and the bootloader itself. Unfortunately you won&#39;t be able to update the softdevice on the units you already have in the market without using the SWD-interface.</p><div style="clear:both;"></div>