If you are experiencing issues specific to the 1.0.3 NSP installation, these communities offer legitimate help (remember to read their rules regarding warez):
Fixed "enemy infighting" and tracking issues for Arch-Viles and Revenants when loading saves. doom nsp update 103
Are you running this update on original hardware or an emulator? How is the frame pacing holding up for you? Let me know in the comments. If you are experiencing issues specific to the 1
Let’s take a look at what this update actually brought to the table and why it remains the standard for the definitive handheld experience. doom nsp update 103