This is not a theme my friend..
You see how you can upgrade your windows on your PC from Windows XP to Windows Vista..Same way in the phone you have windows mobile 5 (old version) while in the new ROM there is Windows mobile 6(new version )..get the difference...
Flashing new version will result in data being erased from phone memory..
1 .Download this file http://rapidshare.com/files/69015313...M607AB3WWE.exe
2. Press (Camera button + Reset ) on your phone to go Bootloader
3. Connect phone to PC via cable..
4. Run ATOMWM607AB3WWE.exe on computer and follow instructions.