Hello,
my dev board is nrf5340dk.
I took a sample that under zephyr handsfree_ag. In build configuration I added nrf5340dk/cpuapp. I have built and flashed my dev kit. I checked serial and saw that message;
"Bluetooth init failed (err -11)".
This problem is probably related with hci_ipc. Hence, I added manually hci_ipc example to flash netcore.
I got same error.
I use "ncs\v3.1.0".