The keyword is a dead end. It combines three incompatible worlds: a 2023 console game, a 2004 handheld emulator, and a compression format. You will waste hours clicking ads and risk malware infections.
Downloading the game in a is essential for mobile users because the full uncompressed ISO files can be quite large.
Every Android gamer has asked it at least once: Can I really play GTA 5 on my phone using PPSSPP?
If you truly want GTA 5 itself on your phone (not an emulated PSP game), you have two official options: