I am using segger embedded studio for nordic board nrf52 board had no problem.
However, when I testing with the micro:bit segger jlink, it failed.
-----------------------------------------------
Connecting ‘J-Link’ using ‘USB’
Connecting to target using SWD
Loaded C:/Program Files/SEGGER/SEGGER Embedded Studio for ARM 3.40/bin/JLink_x64.dll
Firmware Version: J-Link OB-BBC-microbit compiled Mar 24 2017 09:33:30
DLL Version: 6.32c
Hardware Version: V1.00
Target Voltage: 3.300
Device "NRF51822_XXAA" selected.
Found SW-DP with ID 0x0BB11477
Scanning AP map to find all available APs
AP[1]: Stopped AP scan as end of AP map has been reached
AP[0]: AHB-AP (IDR: 0x04770021)
Iterating through AP map to find AHB-AP to use
AP[0]: Core found
AP[0]: AHB-AP ROM base: 0xF0000000
CPUID register: 0x410CC200. Implementer code: 0x41 (ARM)
Found Cortex-M0 r0p0, Little endian.
The connected J-Link (S/N 788039736) is low on memory. Target connection cannot be established
connect failed
Failed to connect to target.
No idcode detected.
Please check connection and Target Interface Type
-----------------------------------------------------------------
I also used Keil 5 for the setup and the micor:bit board gave me the error:
No Cortex-M SW Device found.
The message copied as follow:
JLink info:
------------
DLL: V6.32g, compiled Jun 15 2018 17:26:15
Firmware: J-Link OB-BBC-microbit compiled Mar 24 2017 09:33:30
Hardware: V1.00
S/N : 788039736
* JLink Info: Found SW-DP with ID 0x0BB11477
* JLink Info: Scanning AP map to find all available APs
* JLink Info: AP[1]: Stopped AP scan as end of AP map has been reached
* JLink Info: AP[0]: AHB-AP (IDR: 0x04770021)
* 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: 0xF0000000
* JLink Info: CPUID register: 0x410CC200. Implementer code: 0x41 (ARM)
* JLink Info: Found Cortex-M0 r0p0, Little endian.
***JLink Error: The connected J-Link (S/N 788039736) is low on memory. Target connection cannot be established
Error: Flash Download failed - Target DLL has been cancelled
Flash Load finished at 22:01:44
----------------------------------------------
Please help if there is any setting wrong.
Thanks,

Kan.

Hi Nino,
Thanks for your prompt and helpful reply.
I followed the wiki and here is the output:
I am using both segger embedded studio and keil with no other third party software.
The same cable and setup using official Nordic board with no issues.
However, micro:bit is my target platform.
Good to know that it works with micro:bit but I still have no luck.
Please help.
Thanks,

Kan.

Hi Nino,
Thanks for your reply and I understand.
Enclosed please find 2 log files, one using ses and one using keil 5.
The micro:bit is working properly with microsoft scratch and the ses,keil 5 works ok with nordic boards.
The board is running ok with microsoft scratch download.
Thanks for your help.

Kan
microbit ses.logmicrobit keil 5.log

Hi Nino,
Some progress but not really solve the issues.
I am using my friend's desktop running win 7 ultimate and the micro:bit jlink works ok.
My own development environment is win 10 laptop and probably need to get myself a win 7 desktop.
This is not the best solution but at least it works.
I hope to continue working on the win 10 laptop and can Segger look into this direction?
Thanks,

Kan

Hi Nino,
I tried 3 win 7 machines and they are ok.
I also tried 3 win 10 machines and none of them work.
I guess it is win 10 issues.
Please investigate and see if you can reproduce at your end.
Thanks,

Kan.