If you are looking to play a Western on your handheld that looks like RDR2, here is what these community "patched" versions typically offer: Custom Textures
Because of these extreme hardware limitations, the official, uncompromised version of Red Dead Redemption 2 cannot be compressed, patched, or modified to run natively on a PSP. What Are These "PSP ISO Patched" Files? red dead redemption 2 psp iso download patched
(via PS1 Eboot) : While not native, you can play the original Red Dead Revolver If you are looking to play a Western