Can't get secure_bootloader_ble to run when flashed via nrfjprog

[SleepingDog]

Hi

I'm trying to get a DFU boot loader working on our own custom hardware. My initial approach was to build secure_bootloader_ble using my own public_key.c file and try to get it running on an nrf52dk before attempting to do so on our own board.

When I build the bootloader in SES and run it I can see the bootloader advertising correctly within nRF Connect running on my iPhone. However when I flash it using nrfjprog it does not seem to be advertising. So I suspect I am not flashing it properly.

I'm using:

SES 4.18
nrfjprog version: 10.8.0
SDK 15.3.0
OS: MacOS 10.14.6

Here are the steps I am taking to flash the bootloader and the soft device:

nrfjprog --family nRF52 --eraseall
nrfjprog -f nrf52 --program s140_nrf52_6.1.1_softdevice.hex --sectorerase
nrfjprog --reset --program secure_bootloader_ble_s140_pca10056.hex --family NRF52 --sectoranduicrerase
nrfjprog -f nrf52 --reset

What am I missing or doing wrong?

Thanks

[Hung Bui]

Hi David, 

If you are using SDK v15.3 or later you may have run into this issue: https://devzone.nordicsemi.com/f/nordic-q-a/44768/sdk-15-3-cannot-program-default-bootloader

[SleepingDog]

Thank you! That must have been the problem.

I've changed my programming sequence to the following (same as before but removed --sectoranduicrerase from the bootloader line) and it now works.

nrfjprog --family nRF52 --eraseall
nrfjprog -f nrf52 --program s140_nrf52_6.1.1_softdevice.hex --sectorerase
nrfjprog --reset --program secure_bootloader_ble_s140_pca10056.hex --family NRF52
nrfjprog -f nrf52 --reset