tool

we are using DA14580PRODTLKT for mass program ,
and now need to change our panel to 6 PCB's per panel instead of 12.
It seems that since this device is using RS232 interface to burn the UUT's it has no advantage (time wise) over using J link and burning one unit at a time through the dedicated SW interface

also , If this device is using RS232 interface how will it start burning the SW without a bootloader on the IC prior to burning?
thank you