prusa i 3 help

[prince1232]

i have a prusa i 3.i dont have its config.h file
downloaded marlin and tried to run but it is running only in one direction.x axis is moving forward buy not moving backward.same with other two axis .plz help

[Roberts_Clif]

Need more information to be able to help, as there are many version of Prusa i3's.
The exact version of the 3D Printer, the controller make and version, the extruder style, the lead screw style.

What version of marlin did you want to install. give us more information will Help.