nRF52840 Failed to download sniffer software

Hello,

I jsut received nRF52840 and I'm trying to flash the dongle with nrf sniffer for bluetooth.

I have downloaded nrf connect for desktop, then programmer.

I have connecter the dongle to my laptop, open nrf connect programmer, press the reset button on the dongle, RED led is flashing and I have enabled MCU boot, press write and this error happen :

What should I do?

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