So I had a Tekkit World on 1.something and I tried to update to 2.1 - I downloaded the tool to convert the world and done it. I then loaded up the world in Tekkit 2.1 which is all fine and dandy, apart from the fact that my cables are now apatite ore and other things are jacked up.
Any idea how this happenned? I think it may of been because I didnt have 1.1.4.
Any ideas how I can rollback to other versions?