While flashing the soft-device as per the repo here with the jar file, there happens to be a version conflict between the generated hex file and downloaded one in the path: $../Arduino15/packages/sandeepmistry/hardware/nRF5/0.1.0/cores/nRF5/SDK/components/softdevice/s132/hex/s132_nrf52_2.0.0_softdevice.hex
. (beteen .._nrf52_2.0.0 & .._nrf52_2.0.1).