nrf5340 Bluetooth only works when JLink is connected

[AkuAku]

Hello,

I ordered a nRF5340-PDK board and i'm trying to get it to work.

When flashing the Heart Rate hex file I couldn't find the device (i pushed the reset button).

I tried building from source and it works only with JLink connected (in SES).

I added code to blink an LED to the Heart Rate sampled and flashed it. The LED blinks even without JLink being connected.

So I'm guessing somehow this is related to the network processor? Reading the flash in the programmer utility shows the network processor is flashed properly.

What could be the cause of this issue?

Thanks in advance.

[haakonsh]

Have you reset the device after you've disconnected the debugger?

[AkuAku]

Can we maybe exchange images which are supposed to behave correctly?

Also doing a soft restet in nrfjprog fixes makes the application run correctly, but I'm guessing that's what Connect in SES does. (nrfjprog -d)