Stop the Bantu migrations (no idea how-throw some ASBs at them) so that the Nilotic peoples of Sub-Saharan Africa remain sovereign. They were farmers and gatherers, and lived in towns unlike the pastoralist Bantus, whose constant warfare and measure of status in cattle meant that agriculture and statecraft were limited. The Nilotic kingdoms around the Zambezi River and other agricultural areas become kingdoms and eventually by the 18th century begin to industrialise. It won't be much, but it might, just might, be something. It all depends on their trade-they'll have easy access to the Omanis in Zanzibar, but contact with Europe would be hard and probably only through slavery.
Oh, and if anyone thinks to say 'xxx pulls a Meiji' I shall have to lay my furious vengeance upon them. It's the most over-used, mis-applied term on the board with the possible exception of the unmentionable aquatic mammal, but then at least that's just been turned into a running joke.