How to flash code to application and network cores on nrf5340dk?

[Pelle]

HI
I'm using the nrf5340dk, and I'm able to flash the application core with code that toggles the LEDs. 

But I'm not able to flash the network core. I've specified in the nrf5340dk_nrf5340_cpunet.overlay the flash start address as 0x0100 0000 which should be start address of flash for network core.

But when using the command

nrfjprog --program zephyr.hex --sectorerase --reset

I get the following error:

ERROR: The file specified is not a valid hex file, has data outside valid areas
ERROR: or does not have data in valid areas.

When I look in the hex file it looks like it has an offset of 0x0100 0000 which is correct?

I'm using zephyr and nrfjprog tool.

BR

[Marte Myrvold]

Hi,

You must specify  that you are programming the network core:

nrfjprog -f NRF53 --coprocessor CP_NETWORK --program zephyr/zephyr.hex --chiperase

Best regards,

Marte