I got a bumpmap left hand texture, with no gradients, and it isnt working. I activated it and deactivated it. Can somebody help me?

If you would use the search button, or use the torisupport page then you would notice that bumpmaps dont work in 3.8, they will only work in the next versions.

Also a bumpmaps texture is not equal to a normal texture, aka you wont get colors or anything on a bumpmap.