Look for game files, texture packs, and mods on reputable community forums like Reddit's emulation communities or the official PPSSPP forums. To help you get the best setup, tell me: What Android phone model or processor do you have?
Websites offering a "working" download link for Resident Evil 6 on PPSSPP are usually distributing one of two things: 1. Texture Mods of Older Games Resident Evil 6 Ppsspp Android Game Download WORK
If you want to find a secure way to play survival horror on your phone, let me know: What do you use? Look for game files, texture packs, and mods