https://devzone.nordicsemi.com/f/nordic-q-a/12264/eclipse-gcc-device-does-not-have-required-dfu-serviceAfter i asked this question , i changed to use SDK 8.0.0 hrs "s110_for_dfu", As the same step to try, i downloaded softdevice(s110) & bootloader(for 8.0.0) then opened the master control panel ,selected "dfu targ" to connect and DFU the hrs programen-USTelligent Community 13Tue, 14 Nov 2017 10:43:53 GMT