[1] Under his administration, one of the most positive in the history of his country, reforms were carried out such as the establishment of the jury; The Court of Accounts was created, criminal proceedings were regulated and a good Penal Code was legislated.
Along with these legislative actions, he founded an official newspaper, El Telégrafo Nicaragüense and the town of Rivas received the title of city.
[2] Due to an anti-constitutionalist rebellion in 1834, a great reform of the federal Constitution was planned to take place in 1835, which was only agreed upon by Costa Rica and Nicaragua and consequently did not take effect.
On 25 January 1837 Casto Fonseca, a graduate in medicine, and Colonel Bernardo Méndez de Figueroa "El Pavo", a man only notable for his fondness for gambling, stormed the León barracks and took a man named Braulio Mendiola out of jail, who was given a large escort by the assailants with orders to arrest Zepeda, Colonel Román Valladares, Deputy Pascual Rivas and Captain Evaristo Berríos.
Núñez did not arrest the rebels, but rather appeased Méndez and appointed him General Commander of Arms, but Mendiola was captured and executed for the killings.