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51422 DK cannot support program old softdevice s110 6.0.0 ?

I cannot program an external nRF51822 module(program old softdevice S110 6.0.0) with nRF51-DK p20 (SWD), it give message "invalid parameter error".

and i program the 51422DK without the external board by softdevice S110 6.0.0. it also give message "invalid parameter error".

51422 DK board (PC10028) can program/erase blink example for external board(51822) successfully.

what 's the problem? or 51422 DK cannot support program old softdevice s110 6.0.0 ??

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