Do you have a reliable source, pre-Islam?The written lan
They had nothing but oral tradition passed down from generation to generation.
And yes, Islam did bring some level of civilization to these tribes. Just being honest about these people living on that continent.
Outside of Ethiopia, and tribes close to the Med, there doesn't seem to be much elsewhere; the 17th Century Gold Coast tribes didn't have a written language except for a few traders who learned a little of the European scripts, south Africa doesn't have any indigenous written languages either, and neither did the tribes who were captured by other tribes and sold to European slave traders, no literacy of any kind evident in slaves anywhere.