You cannot rename a .pbp to .iso. That will not work. You need specific software. Here is the toolkit for Windows, Mac, and Linux.
Before we dive into the conversion process, you need to understand the anatomy of these files. convert pbp to iso patched
To get your Patched ISO:
This will give you a working, patched ISO file compatible with PC emulators (DuckStation, ePSXe) or burning to a disc. You cannot rename a