True, the industrial revolution in Europe was somewhat earlier than the migration to Africa. Yet the only real "advanced technology" were the more advanced weapons. Most importantly, there was an "intellectual capital", i.e. the ability to devise new technology, due to better education (trade schools, universities), better agricultural know-how, maritime know-how,  transportation know-how (i.e. the wheel), economics know-how (money), and the accumulated and codified brain power of centuries (mathematics, physics,chemistry  in the form of written records). This in my mind are hallmarks of a civilization which was suitable to European conditions of the time. In Africa there was small-scale agriculture, plant-based medicine, local  markets, animal husbandry (animal products, skins), and in some areas mining and metal working. So there was civilization as a socially and methodically organized activity of the level which was satisfactory enough for local conditions.