nRF52-DK connection error

[Adrien C.]

Hi, I'm trying to program a nRF52-DK, with a workong firmware, and a board that was working, but I can't manage to flash the DK.

With a make flash_softdevice:

Flashing: s132_nrf52_5.0.0_softdevice.hex
nrfjprog -f nrf52 --program ../../../components/softdevice/s132/hex/s132_nrf52_5.0.0_softdevice.hex --sectorerase
ERROR: JLinkARM DLL reported an error. Try again. If error condition
ERROR: persists, run the same command again with argument --log, contact Nordic
ERROR: Semiconductor and provide the generated log.log file to them.
make: *** [flash_softdevice] Error 33

With a  JLinkExe -device nRF52 -speed 4000 -if SWD:

SEGGER J-Link Commander V6.20h (Compiled Oct 27 2017 16:21:13)
DLL version V6.20h, compiled Oct 27 2017 16:21:03

Connecting to J-Link via USB...O.K.
Firmware: J-Link OB-SAM3U128-V2-NordicSemi compiled Jul 24 2017 17:30:12
Hardware version: V1.00
S/N: 682584790
VTref = 3.300V


Type "connect" to establish a target connection, '?' for help
J-Link>connect
Device "NRF52" selected.


Connecting to target via SWD
Cannot connect to target.
J-Link>

Do you have any idea on what HW/SW problem it might be?

[Adrien C.]

In this thread, it was JTAG that was chosen, but I think I correctly choose SWD, any idea ?