Ahmed Abba was arrested in northern Cameroon in July 2015 while investigating Boko Haram.
He denied accusations of acting as an accomplice and failing to warn authorities of activities by the Nigeria-based Islamic extremist group.
Abba's lawyers appealed his April conviction.
Cameroon faced international pressure over the conviction.
Amnesty International described it as a travesty of justice after an unfair trial and said Abba was held in inhumane conditions in overcrowded prisons.
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