I finally managed to make one for the 3d parts
, but had no luck with:
Edit: I added Tartarus codes, enjoy
, but had no luck with:- 2d maps/scenarios
- 2d text and drawings (to eliminate stretching)
Edit: I added Tartarus codes, enjoy

Code:
_S ULUS-10512
_G Shin Megami Tensei: Persona 3 Portable [US]
// IMPORTANT
// I recommend using only X Ratio and 3D Battle codes (Y Ratio is not necessary) and starting from a save inside the game
// You have to disable the cheats after activating them and seeing them work or you might get minor graphic glitches if left on for long
// Game will still look ultrawide after disabling the cheats so dont worry
// Use Y Ratio INSTEAD of X Ratio ONLY if X Ratio is still causing minor graphic glitches after disabling it but it really shouldnt
_C0 PSP 16:9 Default
_L 0x203B2340 3FE1E1E2 // 3D Battles
_L 0x206D94B0 3F0E6F3B // Tartarus original X Ratio
_L 0x203B2084 3F000000 // Tartarus original Y Ratio
_C0 iPhoneXs 3D Battles 19.5:9
_L 0x203B2340 400AB021
_C0 iPhoneXs Tartarus X Ratio 19.5:9
_L 0x206D94B0 3F2D9792
_C0 iPhoneXs Tartarus Y Ratio 19.5:9
_L 0x203B2084 3EE66666 // Not necessary unless X Ratio didnt work well for you
_C0 UltraWide 3D Battles 21:9
_L 0x203B2340 4017B426
_C0 UltraWide Tartarus X Ratio 21:9
_L 0x206D94B0 3F3AF1FE
_C0 UltraWide Tartarus Y Ratio 21:9
_L 0x203B2084 3ECCCCCD // Not necessary unless X Ratio didnt work well for you
// It is a theoretical value cause I havent test this one in an ultrawide screen so maybe try your own value if the game looks odd
