I went ahead & tried the 11/25/15 firmware. I got an error with the firmware 1st time I tried it which was something about max temperature. I commented out the lines related to the heat bed & it seemed to upload ok. It changes the X_MAX_POS correctly, but the Y_MAX_POS seems to stay at 720 since it will not move past this number.
Reply To: Setting X_MAX_POS and Y_MAX_POS in firmware