https://devzone.nordicsemi.com/f/nordic-q-a/3077/nrf51822-and-windows-phone-8-1I have Nokia Lumia 630 and it works well with nRF51822-EK but only with SDK nrf51822_v5.1.0.36092 and SoftDevice 6.0.0. Now I decided to try DFU OTA. I programmed bootloader, SoftDevice 7.0.0 and HRM from SDK nrf51822_v6.0.0.4368. I was not able to connecten-USTelligent Community 13Tue, 14 Nov 2017 10:43:53 GMT