If you want to experience Arthur Morgan’s journey on a handheld device or phone, there are safer, official alternatives:
Use services like Boosteroid to stream the game if you own it on Steam or Epic Games. Red Dead Redemption 2 Ppsspp Zip File Download
If you're still interested in attempting to play Red Dead Redemption 2 on PPSSPP, here's a general guide: If you want to experience Arthur Morgan’s journey
Can the ppsspp emulator play ps1 games? : r/EmulationOnAndroid there are safer