Unable to connect nRF52840 to Nordic Desktop software or load flash softdevice from Keil


Use nRF Connect v2.6.0 on Linux to erase, program softdevice.


Use Keil to program application firmware

Does not work:

Use nRF Go studio to detect the DK, detected serial number, but no device is detected.

Does not work:

Use nRF Connect v2.6.1 on Windows 10, showed error : "Error while probing devices: Error occured when get serial numbers. Errorcode: CouldNotLoadDLL (0x3)"

Does not work:

Use Keil to download Softdevice

Load "..\\..\\..\\..\\..\\..\\components\\softdevice\\s140\\hex\\s140_nrf52_6.1.0_softdevice.hex"
Set JLink Project File to "C:\Users\Projects\nordic\nRF5_SDK_15.2.0_9412b96\examples\ble_peripheral\ble_app_blinky\pca10056\s140\arm5_no_packs\JLinkSettings.ini"
* JLink Info: Device "NRF52840_XXAA" selected.

JLink info:
DLL: V6.40 , compiled Oct 26 2018 15:06:02
Firmware: J-Link OB-SAM3U128-V2-NordicSemi compiled Jul 12 2018 11:44:41
Hardware: V1.00
S/N : 683514616

* JLink Info: Found SW-DP with ID 0x2BA01477
* JLink Info: Found SW-DP with ID 0x2BA01477
* JLink Info: Scanning AP map to find all available APs
* JLink Info: AP[2]: Stopped AP scan as end of AP map has been reached
* JLink Info: AP[0]: AHB-AP (IDR: 0x24770011)
* JLink Info: AP[1]: JTAG-AP (IDR: 0x02880000)
* JLink Info: Iterating through AP map to find AHB-AP to use
* JLink Info: AP[0]: Core found
* JLink Info: AP[0]: AHB-AP ROM base: 0xE00FF000
* JLink Info: CPUID register: 0x410FC241. Implementer code: 0x41 (ARM)
* JLink Info: Found Cortex-M4 r0p1, Little endian.
* JLink Info: FPUnit: 6 code (BP) slots and 2 literal slots
* JLink Info: CoreSight components:
* JLink Info: ROMTbl[0] @ E00FF000
* JLink Info: ROMTbl[0][0]: E000E000, CID: B105E00D, PID: 000BB00C SCS-M7
* JLink Info: ROMTbl[0][1]: E0001000, CID: B105E00D, PID: 003BB002 DWT
* JLink Info: ROMTbl[0][2]: E0002000, CID: B105E00D, PID: 002BB003 FPB
* JLink Info: ROMTbl[0][3]: E0000000, CID: B105E00D, PID: 003BB001 ITM
* JLink Info: ROMTbl[0][4]: E0040000, CID: B105900D, PID: 000BB9A1 TPIU
* JLink Info: ROMTbl[0][5]: E0041000, CID: B105900D, PID: 000BB925 ETM
ROMTableAddr = 0xE00FF000
* JLink Info: Reset: Halt core after reset via DEMCR.VC_CORERESET.
* JLink Info: Reset: Reset device via AIRCR.SYSRESETREQ.

Target info:
Device: nRF52840_xxAA
VTarget = 3.300V
State of Pins:
TCK: 0, TDI: 1, TDO: 1, TMS: 1, TRES: 1, TRST: 1
Hardware-Breakpoints: 6
Software-Breakpoints: 8192
Watchpoints: 4
JTAG speed: 1000 kHz

Erase Failed!
Error: Flash Download failed - "Cortex-M4"
Flash Load finished at 10:26:34