Help! Skr 1.2 store preflashed

Hi I have bought both the mpcnc primo and lowrider 3 kits from the store with the skr pro 1.2 boards I have managed to build everything but I’m very unclear on the firmware that’s ment to be preloaded I’m building both with duel end stops but I don’t know if the firmware has the extruder =0 or extruder =1 for placement of the drivers and steppers the instructions for the boards show two different pictures for the options but I don’t know what one to do

New boards are all EXTRUDERS=0.

The versions are different for the firmware though. 513D is for the MPCNC. 513DL is for the low rider.

The version shows up on the screen, or you can send M115 from a computer.