There is a working solution for MPX200s, which appear to be dead after flashing
on the german site mobiljoe.de .

Here are the instructions for the guys who don't speak german:

1. Remove the battery
2. Press the "Left Key" and hold it while doing the next steps
3. Plug in the USB cable
4. Insert the battery (still pressing the left key)
5. The Phone should be recognizes by Windows

Now you can reflash the phone again :)