I have written this based on the assumption that "upd" refers to an updated version of the software.
Ziso.py: The official Python script provided by the Open PS2 Loader (OPL) GitHub for basic compression and decompression tasks. Implementation and Use Cases iso to zso converter upd
Currently at version 2.3 (UPD Dec 2024), this is the original converter written by the PPSSPP team. I have written this based on the assumption