So you are still running the old version of Marlin.
I recommend that you download the latest version of Repetier Software that has been released by SeeMeCNC.
You can download it here:
https://github.com/seemecnc/RostockMAX
Download the Zip file then you will have the latest Manual and the Firmware.
Unzip the Zip file that you downloaded and you will have a few folders created, the ones we are interested in is the manual and the firmware.
Before we go any further we need to know what is inside your printer such as the number of teeth on the pulleys that are on the motors.
If the number of teeth on the pulleys is 20 then you can proceed with the upgrade, if it is not 20 then it is a bit more difficult because there is a lot more editing that needs done.
If the number of teeth is 20 then you can go into the Repetier folder that you downloaded, find the configuration.h file and open it with notepad. Find a line that has
#define MOTHERBOARD 301 and change it to #define MOTHERBOARD 33 and save the file.
Before going any further I need to know if you know how to use a program called Arduino. If you know what it is then you use it to open the Repetier.ino file in the Repetier folder
and upload the firmware to your Ramps board. After uploading you go to section 17 of the manual, software installation, and follow the manual to the very end.
If you don't know what Arduino is then let me know and we can go into more detail. If the number of teeth on your pulleys is 15 then we need to do a lot more editing before you
can upload the new firmware.