Cannot connect nRF Connect to nRF5340-DK

Hi,

I'm working on a Bluetooth Low Energy audio project, and we are thinking of nRF5340 as good candidate for audio communications in BLE.

I'm getting started with nRF5340 and would like to use nRF Connect to develop on the board.

Attempt to connect ends with error messages:

Selected device with s/n 001050022924
16:21:57.307
Connected to device with serial number: 001050022924 and family: NRF53
16:21:57.307
Note: no pre-compiled firmware is available for the selected device. You may still use the app if you have programmed the device with a compatible firmware.
16:21:57.308
Device setup completed
16:21:57.308
The device is not in the list of supported devices. Attempting to open as a custom device.
16:21:57.308
Opening custom device
16:21:57.308
Note: firmware must be compatible with connectivity firmware version: 4.1.4, SoftDevice API version: 5 and baud rate: 1000000.
16:21:57.309
Opening adapter connected to COM17
16:21:58.247
Successfully opened COM17. Baud rate: 1000000. Flow control: none. Parity: none.
16:21:58.249
Reset performed on adapter COM17
16:22:00.084
Received status with code 0 PKT_SEND_MAX_RETRIES_REACHED, message: 'No response from device. Tried to send packet 6 times.'
16:22:01.250
serial port COM17 closed.
16:22:01.255
Error occured when opening port. Errorcode: NRF_ERROR_TIMEOUT (0xd)
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