AHC/WI: Biafra Successfully Establishes its Independence from Nigeria

As stated in the title, what would it take for Biafra to win its independence war and what kind of butterflies would it create? Bonus points if you can get them to maintain a puppet republic in the Benin region or to incorporate it outright in Biafra.
 
It would be hard but not impossible
They would have to take the capital of Nigeria in a very tough atmosphere but if they do that then Nigeria will possibly implode and the Northern and Southern ethnic factions will start infighting

there was a coup just 2 years earlier where southerners tried to seize total power but it was eliminated by northerners
 
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