error when connect JLink V8 to nRF52823

[Hust]

Hi guys, Currently, I used JLink V8 to program, load code to nRF52823. I connected this JLink to nRf51822, then it works perfectly but when come to nRF52823, it doesnt work anymore and this problem occurs. I connect 4 wires only, Vdd, gnd, SWDCLK, SWDIO. Can u guys please help me. 19263870_1379425785473876_1442971467_o.png

[Keton]

Segger seems to be detected by nRF Go. Have you tried recovering chip as suggested by nRFGo? Try installing most recent nrf command line utilities and running nrfjprog --family nrf52 --recover from command line. PS. make sure that you have latest J-Link software installed and up to date firmware on your programmer.

[Hung Bui]

Could you update your question with a close-up picture of your set-up? Note that you need to connect VDD of your target board to VTG on the programmer.