Your PSP must have CFW (e.g., PRO-C or ME) installed to run unofficial EBOOTs.
How Do I combine The Resident Evil 2 discs? - RetroPie Forum psp resident evil 2 eboot install
To install the game, follow these steps using a computer and your PSP's memory card: Prepare the EBOOT Your PSP must have CFW (e
You can either download a pre-made EBOOT (often found as a single multi-disc file) or convert your own ISOs using PSX2PSP . Your PSP must have CFW (e.g.