In blogger. i reverted my template in order to change my layout. how do i un revert it?

i changed my layout. but i need to revert my template. i reverted it and i cannot unrevert it.. help!
In blogger. i reverted my template in order to change my layout. how do i un revert it?
Once.. you change your template..there's no way to revert it back..


So, always make sure you backup your current template before installing any new templates..