Technology that was more complex than what the people already there were using, yes.
Civilization? There were sophisticated civilizations in parts of Africa thousands of years before any European decided, "Hey, that's good real estate, let's go take it!".
Part of the reason we know how the ancient Egyptians thought of, and treated, foreigners is because they recorded it. The images in the temples and stele and palaces and tombs weren't just pretty pictures. They are the history and the proclamations and the thoughts of the time in which they were created. It took knowledge of mathematics and physics to create their civilization, and some non-Egyptians in their jealousy and spite decided that there had to be divine intervention that made it possible. Modern close-minded people insist it had to be space aliens, because no human could ever have constructed such things...
Those who can be termed "colonizers" in Africa - the Europeans, in particular, brought
different technology and
different variety of civilization, but it's incorrect to say there was none there to begin with.