If you are trying to go to a stock ROM then here:
http://216.139.227.226/RUU_PPST_Vogu..._2.04_Ship.exe
IF you want a custom rom then go here:
http://forum.ppcgeeks.com/forumdisplay.php?f=59
Hope that helps. When u are flashing to a rom its pretty much plug and play, FOLLOW ALL DIRECTIONS!!!
If i helped please say thanks!!!