Modeling of the GERDA data after the upgrade

GERDA was an experiment at the Gran Sasso underground laboratories searching for neutrinoless double-beta decay of 76Ge. During 2018 the apparatus was upgraded, introducing possible new sources of contamination. A background model of the full-range energy spectrum acquired by germanium detectors before applying high level cuts (Pulse Shape Discrimination and LAr veto) after the upgrade is reported. From this analysis it is possible to understand the origin of the collected events, make a precise measurement of the half-life of the Standard Model allowed two neutrino decay mode and obtain information about the purity of the materials for future experiments’ strategies