Flashing a Fio via XBee

Greets,

I'm trying to flash a Fio using the XBee module. I have the RTS and D3 pin jumped. I have the baud rate set to 57.2KBaud. They can communicate just fine otherwise.

But I get No Joy trying to download a sketch.

I don't want to solder pins on the boards as they will be hard to remove and I plan to remove them :), so =carefully= using an FTDI board for flashing sketches is hit-or-miss at times.

Please tell me I'm missing something obvious. Or that it just doesn't work ...