nRF51-SDK 6.1.0 and DFU via Master Control Panel for Windows

Question

Hi, 
 I have updated my nRF51-SDK to the latest version 6.1.0. I'm using PCA10000 dongle, nRF6310, PCA10004 and Master Control Panel for Windows. I've programmed my nRF51 device (PCA10004) using SoftDevice file "s110_nrf51822_7.0.0_softdevice.hex" and then uploaded new bootloader.hex from ...
rf6310\device_firmware_updates\bootloader\arm_build directory and finally I have uploaded ble_app_hrs.hex sample code via DFU. Is it possible now to enter bootloader mode again and upload new sample .hex file? How to enter bootloader mode via over-the-air command (buttonless bootloader mode)? 
 I've also tried to upload ble_app_hrs_dfu.hex file but I was able to do this only once. During the second firmware upload (once again the same ble_app_hrs_dfu.hex file) via DFU I've got an error "Data could not be sent - failed!!!". 
 
 Thx, Adam

Torsten Rasmussen · Accepted Answer

Hi, 
 The failure happens because Master Control Panel is not yet able to handle the swap from application to bootloader/DFU mode. 
 The HRS application does not contain the full DFU implementation but only the service.
Writing 'Start DFU' to the Control Point makes the application jump into Bootloader/DFU mode and from there the MCP can be used to perform the update. 
 Jumping from app to bootloader/DFU is a manual step that can be done in MCP. 
 Just follow the procedure in the attached screen shots.
And once this is done, then do a new Service discovery and perform your update using DFU from Master Control Panel. 
 note Make sure that the Heart Rate application your are using is the ble_app_hrs_dfu from the project with same name. The normal Heart Rate project does not contain the needed DFU service.

nRF51-SDK 6.1.0 and DFU via Master Control Panel for Windows

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