mkit use debug out P20 program standalone third part brd

[jjww]

HI I am trying to use mkit as programmer by P20

FOR third part BLE brd

VDD---mkit.vdd GND--mkit.gnd SWD--P20.4 SWC--P20.5

bisides, for P20.3(SH_VTG) connected to mkit.vdd P20.8(SH_GND-DETECT) connected to mkt.gnd those two pins are used to detect external brd connection as my understanding.

but the mkit still program the nrf chip on its own brd instead of external brd, May I know what else should I do?

Thanks

[jjww]

I have connection ref of other downloader

github.com/.../Board:-yunjia-nrf51822