custom css mail signature with 2.0 not working ?

hello
on my iphone 1.1.4 i used to have a custom css signature wich i made and then put it on the phone with ssh and cyberduck
i replaced the original com.apple.mobilemail.plist with my custom one.

now with the new software i tried replacing the sig again but it doesn´t show in the email ... i did exacly the same thing the replacing works but it just doesn´t show in the mail...
any ideas ???
thanks for your help in advance

 

it´s till there

/private/var/mobile/Library/Preferences/com.apple.mobilemail.plist

but if i try to make changes it let´s me replace the original one with the custom one but the changes disappear...