DFU using serial SDK8.0

[EL34PP]

Hi,

I try to evaluate DFU using serial but found difficulty. Seeking help here.

I use PCA10028. First, i falsh S110, v8.0 into it.

Then, compile SDK8.0.0\examples\dfu\bootloader\pca10028\dual_bank_serial_s110\arm5_no_packs\dfu_dual_bank_serial_s110_pca10028 code and flash into the board. After flashing the bootloader, LED3 on.

At PC, i check Jlink CDC UART Port and modify to 115200,8,N,1,HW.

Then, i open nRFgo Studio (ver 1.19.0.7). Goto DFU using serial bootloader. Browse "/nRF51_SDK_8.0.0_5fc2c3a/examples/dfu/hci_dfu_send_hex/test_images_dual_bank_update/dfu_test_app_hrm.hex", select application.

Select "Segger" com port, set 115200 baudrate and select "use flowcontrol"

Then press "Program"

It prompt me to reset device to bootloader. Then, i press "OK". At the log screen, it shows: "-target is not is DFU mode. If using the SDK examples, press Button4 and RESET and release both to enter DFU mode."

Does anyone give me hint what i did wrong?

Thanks.

[Simen]

Use the nrf.exe executable in <studio_root>/nrf_utility.

"nrf.exe dfu serial --help" should help you get started.