In fermentation, the only ATP produced was during glycolysis and the fermentation reactions usually result in resetting the NADH to NAD.

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During fermentation, the only ATP produced is during glycolysis. However, the fermentation reactions result in the conversion of pyruvate to other compounds such as lactic acid or ethanol, and in the process, the NADH produced during glycolysis is oxidized back to NAD+ so that it can participate in another round of glycolysis. This "resetting" of NADH to NAD+ is necessary for glycolysis to continue, as glycolysis requires NAD+ as a cofactor.

In Fermentation, the Only ATP Produced Was During Glycolysis and the Fermentation