You can use nRF Connect Programmer to program the modem and to program applications onto nRF9160 DK.
You can program applications either on the nRF9160 System in Package (SiP) or on the nRF52840 System on Chip (SoC) of nRF9160 DK. You can select the target to be programmed by using the PROG/DEBUG SW10 switch (SW5 for v0.9.0 and earlier) on the nRF9160 DK.
You can use the Programmer to update nRF9160 modem firmware on all kits with the nRF9160 SiP. To do so, click Add file, select the modem firmware zip file, then click Write.