Yes, you can revert a ZSO file back to its original ISO format. In fact, supports decompression, allowing you to convert in both directions. The command maxcso --decompress file.zso -o file.iso will rebuild the full, uncompressed ISO image.
Major emulators, including PPSSPP (for PSP) and PCSX2 (for PS2), natively support the ZSO format. You do not need to extract the files back to ISO to play them. Top ISO to ZSO Converter Tools iso to zso converter
The PPSSPP emulator supports ZSO files automatically. Move your .zso files into your designated game directory, and PPSSPP will detect, display, and launch them instantly. On Real PSP Hardware (Custom Firmware) Yes, you can revert a ZSO file back
YACC is a user-friendly Windows GUI originally designed for CSO but updated to support ZSO. Major emulators, including PPSSPP (for PSP) and PCSX2
Maxcso is the gold standard for fast ISO compression. It is a command-line tool available for Windows, macOS, and Linux that supports block-based compression using both CSO and ZSO formats. It utilizes multiple CPU cores to compress files at blistering speeds. For users who dislike command-line interfaces, various developers have created graphical user interface (GUI) skins for Maxcso. 2. ZSO (By Sulaku)
Using MaxCompress as an example:
"ZSO is similar to ISO, but starts a bit faster on OPL due to compression".