Search for a GTA 5 ISO file. This might be challenging since it's not officially supported. Forums, Reddit, and certain gaming communities might have threads on where to find it safely.
They never announced or developed GTA 5 for any portable system before the PS Vita (which also never received GTA 5). Search for a GTA 5 ISO file
To experience the actual Grand Theft Auto V (not a mod) on a mobile device, you must use streaming technology: Search for a GTA 5 ISO file
Most links labeled “GTA 5 PPSSPP” are actually: Search for a GTA 5 ISO file