He didn’t. In fact his results in the final free election were considerably worse than the year before. He had to enter a coalition with the Centre Party that enabled him to destroy the Weimar democracy from within.

On 9 January 1933, Papen and Hindenburg agreed to form a new government that would bring in Hitler. On the evening of 22 January in a meeting at the villa of Joachim von Ribbentrop in Berlin, Papen made the concession of abandoning his claim to the chancellorship and committed to support Hitler as chancellor in a proposed “Government of National Concentration”, in which Papen would serve as vice-chancellor and Minister-President of Prussia. On 23 January, Papen presented to Hindenburg his idea for Hitler to be made chancellor, while keeping him “boxed” in. On the same day Schleicher, to avoid a vote of no-confidence in the Reichstag when it reconvened on 31 January, asked the president to declare a state of emergency. Hindenburg declined and Schleicher resigned at midday on 28 January. Hindenburg formally gave Papen the task of forming a new government.

In the morning of 29 January, Papen met with Hitler and Hermann Göring at his apartment, where it was agreed that Papen would serve as vice-chancellor and Commissioner for Prussia. It was in the same meeting that Papen first learned that Hitler wanted to dissolve the Reichstag when he became chancellor and, once the Nazis had won a majority of the seats in the ensuing elections, to activate the Enabling Act in order to be able to enact laws without the involvement of the Reichstag. When the people around Papen voiced their concerns about putting Hitler in power, he asked them, “What do you want?” and reassured them, “I have the confidence of Hindenburg! In two months, we’ll have pushed Hitler so far into the corner that he’ll squeal.”

https://en.wikipedia.org/wiki/Franz_von_Papen#Bringing_Hitler_to_power