M501 To RAMPS And Not Responded (no replies)

Hi guys

I am using repetiter-host and printrun sometimes to operate my Mendel i2. Unfortunately, when I wanted to see my parameters from EEPROM using gcode m501, it didn't respond. Neither repetiter nor printrun worked. The motors moved all right so the RAMPS probably has received the code.

Why?

It DID return the numbers with my old printrboard...

Thanks.