For error "nrf Connect for Desktop v3.9"

I’m going to download from nrf52840 using j-link.
However, there is an error that recognizes well in “SEGGER”, but does not recognize in “nrf connect for desktop”.
Error Windows

SEGGER Message

Connecting to J-Link via USB...O.K.
Firmware: J-Link ARM V8 compiled Nov 28 2014 13:44:46
Hardware version: V8.00
S/N: 1084599810
License(s): RDI,FlashDL,FlashBP,JFlash,GDBFULL

Type "connect" to establish a target connection, '?' for help
Unknown command. '?' for help.
Please specify device / core. <Default>: CORTEX-M4
Type '?' for selection dialog
Please specify target interface:
  J) JTAG (Default)
  S) SWD
  T) cJTAG
Specify target interface speed [kHz]. <Default>: 4000 kHz
Device "NRF52840_XXAA" selected.

Connecting to target via SWD
Cannot connect to target.

Well the Segger JLink software can’t connect either, so it’s the same with the “nRF Programmer” application.

Double check all connections between the JLink and the target nRF chip – SWDIO, SWCLK, GND, VTARGET → 3.3V, that the target is powered, that it’s not held in RESET, etc.

Otherwise ask at the nRF or segger forums – not sure how this is related to PlatformIO.

I succeeded in connecting to the target with jlink.

The second last line says Cannot connect to target.

I made a wrong decision. ^^;