The Precision Reactor Oscillation and SPECTrum (PROSPECT) experiment measures the spectrum of antineutrinos from the High Flux Isotope Reactor and searches for potential short-baseline oscillations. The analyses performed to produce the last published results from the current dataset (PROSPECT-I) excluded initially unusable data obtained from some detector segments containing non-operating PMTs. Recent efforts from the collaboration have resulted in a more sophisticated analysis that includes the Single Ended Event Reconstruction (SEER) of the previously unused segments, and the careful data splitting (DS) of the different time periods to maximize the available statistics.In this poster we will focus on the spectrum analysis of PROSPECT-I using the updated dataset. In particular, the application of the Wiener-SVD unfolding technique to produce the final PROSPECT-I antineutrino energy spectrum will be reviewed emphasizing its effect over the multi-period data splitting. We will also detail a pathway to compare the updated positron energy spectrum with PROSPECT's previous results and how can be used to test the gaussian-bump extended Huber-Mueller model. This work was performed under the auspices of the US DOE Office of High Energy Physics by LLNL under Contract DE-AC52-07NA27344, the Heising-Simons Foundation, CFREF and NSERC of Canada, and internal investments at all institutions. LLNL-ABS-833063.