XT09-SI OEM modules non-responsive after firmware version change?

I have two XT09-SI OEM units ( purchased from here:
http://www.sparkfun.com/products/9411 )

They are now totally non-responsive, and from all outward appearances, “bricked”.

They are connected to two PC’s using a breakout board ( http://www.sparkfun.com/products/9596) and FTDI style connectors ( like these: http://www.sparkfun.com/products/9716 ) to connect via USB.

I am in Australia, I used X-CTU tochange the firmware to support “Australian” frequency-hopping mode, which should consist of pressing the “Read” button, change “function set” in drop-down, and then pressing the “write” button.

When doing that, it performed the read perfectly, and I got a “flash error” when writing the result, and I can no longer communicate with the device at all.

Is there a way to “unbrick” these devices, and return them to “factory default”?

Just a couple of further notes…

Before the change, they were in an essentially default configuration ( only changed the baud rate, VID, and Powerlevel, to 57600, 0222, 100mW ) , and they were communicating fine. I initially made those changes on both devices with X-CTU, with no problem.