https://devzone.nordicsemi.com/f/nordic-q-a/22847/transfer-the-firmware-imageHi I&#39;m trying to implement DFU in my project. So far, after I sending 01-04 to the control point characteristic(1531)，I can get bootloader signal, to be exactly, i can enter the DFU mode. However, when I tried to write image size to the packet UUIDen-USTelligent Community 13Thu, 13 Jul 2017 14:42:05 GMThttps://devzone.nordicsemi.com/thread/89827?ContentTypeID=1Thu, 13 Jul 2017 14:42:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b043df82-71d8-4fdc-a02d-714d039908fabjorn-spockeli<p>Hi Alfred, are you still seeing this issue?</p><div style="clear:both;"></div>