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How to connect nRF5340 bluetooth low energy?

I just buy nRF5340.

I install nRF Connect in my PC.

and install bluetooth app.

I just select my pdk.

log show

INFO Connected to device with serial number: 000960119975 and family: nrf53
2020-08-17T13:51:10.597Z DEBUG 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 connectivity firmware.
2020-08-17T13:51:10.597Z INFO The device is not in the list of supported devices. Attempting to open as a custom device.
2020-08-17T13:51:10.597Z INFO Opening custom device
2020-08-17T13:51:10.597Z INFO Note: firmware must be compatible with connectivity firmware version: 4.1.2, SoftDevice API version: 5 and baud rate: 1000000.
2020-08-17T13:51:10.599Z INFO Opening adapter connected to COM4
2020-08-17T13:51:11.519Z INFO Successfully opened COM4. Baud rate: 1000000. Flow control: none. Parity: none.
2020-08-17T13:51:11.519Z DEBUG State change: STATE_START -> STATE_RESET
2020-08-17T13:51:11.519Z DEBUG 1 -> [N/A] type: RESERVED_5 reliable: no seq#:0 ack#:0 payload_length:0 data_integrity:0 err_code:0x0
2020-08-17T13:51:11.519Z INFO Reset performed on adapter COM4
2020-08-17T13:51:11.820Z DEBUG State change: STATE_RESET -> STATE_UNINITIALIZED
2020-08-17T13:51:11.820Z DEBUG 2 -> [01 7e ] type: LINK_CONTROL_PACKET reliable: no seq#:0 ack#:0 payload_length:2 data_integrity:0 err_code:0x0 [SYNC]
2020-08-17T13:51:12.071Z DEBUG 3 -> [01 7e ] type: LINK_CONTROL_PACKET reliable: no seq#:0 ack#:0 payload_length:2 data_integrity:0 err_code:0x0 [SYNC]
2020-08-17T13:51:12.321Z DEBUG 4 -> [01 7e ] type: LINK_CONTROL_PACKET reliable: no seq#:0 ack#:0 payload_length:2 data_integrity:0 err_code:0x0 [SYNC]
2020-08-17T13:51:12.572Z DEBUG 5 -> [01 7e ] type: LINK_CONTROL_PACKET reliable: no seq#:0 ack#:0 payload_length:2 data_integrity:0 err_code:0x0 [SYNC]
2020-08-17T13:51:12.822Z DEBUG 6 -> [01 7e ] type: LINK_CONTROL_PACKET reliable: no seq#:0 ack#:0 payload_length:2 data_integrity:0 err_code:0x0 [SYNC]
2020-08-17T13:51:13.072Z DEBUG 7 -> [01 7e ] type: LINK_CONTROL_PACKET reliable: no seq#:0 ack#:0 payload_length:2 data_integrity:0 err_code:0x0 [SYNC]
2020-08-17T13:51:13.322Z DEBUG State change: STATE_UNINITIALIZED -> STATE_NO_RESPONSE
2020-08-17T13:51:13.323Z ERROR Received status with code 0 PKT_SEND_MAX_RETRIES_REACHED, message: 'No response from device. Tried to send packet 6 times.'
2020-08-17T13:51:14.520Z DEBUG serial port read on port COM4 aborted.
2020-08-17T13:51:14.534Z ERROR Error occured when opening port. Errorcode: NRF_ERROR_TIMEOUT (0xd)

What's problem?

help me. Thank you

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