Cannot upload sketch to nRF52 DK

[BNRock]

Trying to upload blink sketch to my nrf52DK. Followed the instructions regarding installking J-Link drivers through Zadig. I uninstalled, and reinstalled J-Link drivers, then wrote over CDC (Interface 2) with the WinUSB (v6.1.7600.16385) driver. However, when trying to upload code in Arduino IDE, getting following error:

Open On-Chip Debugger 0.10.0-dev-00254-g696fc0a (2016-04-10-10:13)
Licensed under GNU GPL v2
For bug reports, read
	http://openocd.org/doc/doxygen/bugs.html
debug_level: 0
swd
adapter speed: 10000 kHz
cortex_m reset_config sysresetreq
Error: No J-Link device found.
Error: No Valid JTAG Interface Configured.
Failed uploading: uploading error: exit status 255