nRF52840DK - problems getting started

[Alex_S@Aperia]

Purchased nRF52840 DK. 
Plugged it with USB cable to my Win11 PC
Trying to follow instructions in the enclosed brochure, which points to nordicsemi.com/start52840dk
Step 4 - Flip the power switch to "on"


The switch highlighted in the picture is marked VEXT->nRF, power switch is to the left of it.
So, I flip the actual power switch. The power source switch is set to VDD.
LED 1 starts blinking very slowly, LED 5 is blinking very fast
I don't see any pop-ups or any other indication that PC recognizes the board, no COM port get created.
I have SEGGER J-Link V7.96f for Windows installed.
J-Link commander fails to find the DK
Is there any additional software I need to install ? 

[Alex_S@Aperia]

Quick Start  app doesn't find the board either. It says "contact support on DevZone and provide the log", here it is

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Fullscreen 2024-05-02T02_22_27.538Z-log.txt Download

2024-05-02T02:22:27.754Z INFO Initialising nrfutil module: device
2024-05-02T02:22:27.763Z DEBUG Started watching devices
2024-05-02T02:22:29.462Z INFO Using nrfutil-device core version: 7.7.1
2024-05-02T02:22:30.307Z INFO Using nrfutil-device version: 2.1.1
2024-05-02T02:22:30.308Z INFO Using nrf-device-lib version: 0.17.5
2024-05-02T02:22:30.308Z INFO Using nrfjprog DLL version: 10.24.0
2024-05-02T02:22:30.309Z INFO Using JLink version: JLink_V7.94e