Okay so i did some high map thing and it took all my mt’s away 
what do i do to fix it i have tried everything
One more time, except this time in English please?
Okay so i did the flatten high map and i think i missed up cause everything this flat now no bumps nothing what do i do to get my mt’s and hills back
mt’s might mean materials… maybe, or mountains, ok no, I’m stumped lol.
Well, you flattened your terrain, what did you expect it to do?
god *** you people are no help
It is quite possible that you are beyond help, but I’ll try.
Restore your project from the backup you made before your mt’s where taken away, whatever they are.
Okay i did, and it worked but see since you actually helped my project got fixed.
Flatten
–verb (used with object)
1.
to make flat.
So you clicked “Flatten heighmap” and you made your heightmap — which is what controls terrain height — flat, what did you expect to happen?
I hope this at least teaches someone that it’s always a good idea to have backups of the projects, recent ones if possible 
Another good idea is to export your heightmap when you get it perfect, no matter how many iterations of ‘perfect’ you go through, if it’s ‘perfect’ export it.