Did you try to hard reset or just assume that your phone cannot be hard reset at this point. If you did and the phone still shows serial at the top then you are stuck in bootloader. To fix this click the link below and follow the instructions.
http://forum.ppcgeeks.com/showthread.php?t=7049
Once the phone reboots, place phn in bootloader to flash the wm6 rom.
Click on chat if you are in need of more assistance, there is always somebody there to help.