[Request] Tree Model Fix

Well I have this tree model from a long time ago, don't know who made it... But the wrong sides of most of the leaves are shaded, and I have no clue about modeling, but could someone please fix it?

I think it's a simple problem! :o

Would appreciate any help

I made that material unshaded, but I dont know if it is better.

Dont really know much about this modelling stuff.

edit. My friend kitabatake told that its better to recalculate normals or some stuff like that, than not to use shading.

That 4-2 named thingy is one with recalculated normals.

It would be cool if you told me whether that stuff works or not when you have tested that model.

ATM I'm just using the unshaded one, as the one with recalculated normals still has odd shading :/

It's fine for now though :)