https://devzone.nordicsemi.com/f/nordic-q-a/20541/sdk13-0-0-secure-boot-loaderHi all, I&#39;m working on SDK13.0.0 secure bootloader and I&#39;m curious to know about Why nordic defined, dfu service uuid(0xFE59) is 16-bit uuid and characteristics in dfu service is 128-bit uuid, is their any special reason? In SDK11.0en-USTelligent Community 13Mon, 20 Mar 2017 13:01:45 GMThttps://devzone.nordicsemi.com/thread/80078?ContentTypeID=1Mon, 20 Mar 2017 13:01:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:70305d87-7815-4e5d-b922-3a36f28d6c6fVidar Berg<p>Hi,</p> <ol> <li> <p>We have not registered any 16-bit uuids for DFU our characteristics, only for the DFU service itself.</p> </li> <li> <p>The buttonless characteristic does not have the same properties as the control point and packet characteristic used by the bootloader.</p> </li> <li> <p>We have not implemented bond sharing yet, but is possible to implement in a similar way as we did with the legacy bootloader in SDK 11.0.0. Unfortunately, we don&#39;t have any documentation explaining how to add it to the secure bootloader.</p> </li> </ol><div style="clear:both;"></div>