Flash a nrf52840dk sniffer board

I programmed a nrf52840dk board (PCA10056 3.0.0 2022.7 1050288497) as a sniffer. It works well.

Now I want to flash it to zephyr samples/basic/blinky by "west flash".
west flash
-- west flash: rebuilding
ninja: no work to do.
-- west flash: using runner nrfjprog
-- runners.nrfjprog: reset after flashing requested
FATAL ERROR: Unable to find a board; is the board connected?

ls -hal /dev/serial/by-id

usb-ZEPHYR_nRF_Sniffer_for_Bluetooth_LE_49F8F9D7E8AE3B9E-if00 -> ../../ttyACM0

I tried to hold RESET button and cycled the power but it still ran into sniffer.

Thanks!

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