Cannot program nRF52840 chip

Question

Hello,

I have an nRF52840 custom board, I'm unable to connect with the board using J-Link EDU after programming once. Here is the connection diagram, I have used same connections on another board with nRF52832 chip.

Here is the log file:

Fullscreen jlink_log.txt Download

T3940 4755:806 SEGGER J-Link V6.40b Log File (0002ms, 3126ms total)
T3940 4755:806 DLL Compiled: Jan 22 2019 11:30:26 (0002ms, 3126ms total)
T3940 4755:806 Logging started @ 2019-12-20 14:22 (0002ms, 3126ms total)
T3940 4755:808 JLINK_ExecCommand("EnableAutoUpdateFW", ...).   returns 0x00 (0000ms, 3126ms total)
T3940 4755:808 JLINK_OpenEx(...)
Firmware: J-Link EDU Mini V1 compiled Jan  7 2019 14:01:42
Hardware: V1.00
S/N: 801006937
Feature(s): FlashBP, GDB
TELNET listener socket opened on port 19021WEBSRV 
Starting webserver (0038ms, 3164ms total)
T3940 4755:808 WEBSRV Webserver running on local port 19081 (0038ms, 3164ms total)
T3940 4755:808   returns O.K. (0038ms, 3164ms total)
T3940 4755:846 JLINK_GetEmuCaps()  returns 0xB8EA5A33 (0000ms, 3164ms total)
T3940 4755:847 JLINK_GetFirmwareString(...) (0000ms, 3164ms total)
T3940 4755:848 JLINK_GetDLLVersion()  returns 64002 (0000ms, 3164ms total)
T3940 4755:848 JLINK_GetHardwareVersion()  returns 0x2710 (0000ms, 3164ms total)
T3940 4755:848 JLINK_GetHWStatus(...)  returns 0x00 (0001ms, 3165ms total)
T3940 4755:849 JLINK_ExecCommand("ProjectFile = "E:/COBRA-Hotshot_Firing_System/Hotshot_Firmware/hw_v1.3_sdk16/Hotshot_firmware/hotshot_s140_nrf52840_Debug.jlink"", ...).   returns 0x00 (0003ms, 3168ms total)
T3940 4755:852 JLINK_EMU_GetCurrConnectionInfo()  returns 0 (0000ms, 3168ms total)
T3940 4755:852 JLINK_DEVICE_GetIndex(sDeviceName = nRF52840_xxAA)  returns 1787 (0000ms, 3168ms total)
T3940 4755:852 JLINK_ExecCommand("device = nRF52840_xxAA", ...). Device "NRF52840_XXAA" selected.  returns 0x00 (0003ms, 3171ms total)
T3940 4755:855 JLINK_DEVICE_GetIndex(sDeviceName = nRF52840_xxAA)  returns 1787 (0000ms, 3171ms total)
T3940 4755:855 JLINK_DEVICE_GetInfo(DeviceIndex = 1787)  returns 0 (0000ms, 3171ms total)
T3940 4755:855 JLINK_GetEmuCaps()  returns 0xB8EA5A33 (0000ms, 3171ms total)
T3940 4755:855 JLINK_TIF_GetAvailable(...) (0000ms, 3171ms total)
T3940 4755:856 JLINK_TIF_Select(JLINKARM_TIF_SWD)  returns 0x00 (0001ms, 3173ms total)
T3940 4755:857 JLINK_GetEmuCaps()  returns 0xB8EA5A33 (0000ms, 3173ms total)
T3940 4755:857 JLINK_SWO_Control(JLINKARM_SWO_CMD_GET_SPEED_INFO, ...)  returns 0x00 (0001ms, 3174ms total)
T3940 4755:858 JLINK_SetEndian(ARM_ENDIAN_LITTLE)  returns 0x00 (0000ms, 3174ms total)
T3940 4755:858 JLINK_GetEmuCaps()  returns 0xB8EA5A33 (0000ms, 3174ms total)
T3940 4755:858 JLINK_SetSpeed(4000) (0001ms, 3175ms total)
T3940 4755:859 JLINK_GetSpeed()  returns 0xFA0 (0000ms, 3175ms total)
T3940 4755:859 JLINK_Connect() >0x10B TIF> >0x10F TIF> >0x10B TIF> >0x10F TIF> >0x10B TIF> >0x10F TIF> >0x10B TIF> >0x10F TIF> >0x10B TIF> >0x10F TIF> >0x10B TIF> >0x10F TIF> >0x10B TIF> >0x10F TIF> >0x10B TIF> >0x10F TIF> >0x10B TIF> >0x10F TIF> >0x10B TIF> >0x10F TIF> >0x10B TIF> >0x10F TIF> >0x10B TIF> >0x10F TIF> >0x10B TIF> >0x10F TIF> >0x10B TIF> >0x10F TIF>  returns 0xFFFFFFFF (0837ms, 4012ms total)
T3940 4756:698 JLINK_IsOpen()  returns 0x01 (0000ms, 4012ms total)
T3940 4756:730 JLINK_Close() (0003ms, 4015ms total)
T3940 4756:730  (0003ms, 4015ms total)
T3940 4756:730 Closed (0004ms, 4016ms total)

What I cannot understand that why I cannot connect with boards after programming once successfully. This is the message I receive when try to connect:

Here is the log from J-Link commander:

SEGGER J-Link Commander V6.40 (Compiled Oct 26 2018 15:06:29)
DLL version V6.40, compiled Oct 26 2018 15:06:02

Connecting to J-Link via USB...O.K.
Firmware: J-Link EDU Mini V1 compiled Jan  7 2019 14:01:42
Hardware version: V1.00
S/N: 801006937
License(s): FlashBP, GDB
VTref=3.157V


Type "connect" to establish a target connection, '?' for help
J-Link>connect
Please specify device / core. <Default>: NRF52840_XXAA
Type '?' for selection dialog
Device>nrf52840_xxaa
Please specify target interface:
  J) JTAG (Default)
  S) SWD
  T) cJTAG
TIF>s
Specify target interface speed [kHz]. <Default>: 4000 kHz
Speed>4000
Device "NRF52840_XXAA" selected.


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

Regards.