I got that information by downloading and running the MP610 firmware update tool (see screenshot below).
Update: I managed to dump the firmware (pm.bin) by using a newer version of the ISP tool (M7103ISP_0.96.0). The version I tried earlier was 0.79 (I think) which failed, but 0.96 works. If you wish, I could upload the newer mptool and m701isp software. In case you are wondering, it is packaged with Chillkat ZIP 2 Secure EXE, but I managed to get the files out of the temp directory and they seem to work.