According to the documentation I've seen, an XD-V75 is needed to update firmware in an XD-V70.  I'm wondering if it is possible to update firmware in an XD-V70 without a XD-V75?  I'm thinking perhaps an RS232 9-pin to the XD-V70's TRS connection along with a PC running Hyperterm may provide the necessary com link.

I'm thinking this might work since there had to be a way to update the XD-V70 firmware prior to the existence of the XD-V75.