Hi, I think I solved the issues. Steps :
1 bake the texture in Cheethan and import it as Material.
2 delete the bake icons, you don’t need it anymore.
3 delete all the unnecessary materials used for baking.
4 set the imported Material as UV2 in the material panel and in the object panel.
5 export as .3ds
6 now it should work in prefab 
7 you can export as AWD2 and load in AWAY3d 4 without any problem.
I day for this ! Hell !
One question :
Prefab scales the cheetah model in a range from 600 to 750 times, and on Ipad I scale the model 0.5 to see it at fullscreen. Do we have a method to calculate the scale instead of testing it ?
Regards