No. Undertale was originally developed using , an engine that does not natively support exporting to the PSP. Official console versions were later released for the PlayStation 4, PlayStation Vita, Nintendo Switch, and Xbox One. Any file claiming to be an "official" PSP ISO is likely a fan project or, in some cases, malicious software. Unofficial Fan Ports and Projects
While there is no official version of Undertale for the PlayStation Portable (PSP), several fan-led initiatives have emerged to bring Toby Fox's masterpiece to the classic handheld. This guide covers the current landscape of Undertale on the PSP, what to expect from unofficial ports, and where you can play the game officially. Does an Official "Undertale PSP ISO" Exist? Undertale Psp Iso Download REPACK
A project featured in game jams that aims to recreate the Undertale experience on the PSP. These are often remakes from the ground up rather than direct ports of the original code. Any file claiming to be an "official" PSP
        