Since a native Tekken 4 PSP ISO does not exist, enthusiasts use or Tekken: Dark Resurrection (both official PSP titles) as a base for "Tekken 4 Mods".
Developers in the modding community create custom skin and move-set packs for Tekken 6 on PPSSPP that replicate the Tekken 4 aesthetic, including the iconic dark-themed costumes and specific character models like the long-haired King. Tekken 4 Ppsspp
Select Vulkan for better performance on modern Android devices, or OpenGL for older hardware. Since a native Tekken 4 PSP ISO does
Set to Off for fighting games, as any skip can disrupt your combo timing. Tekken 4 Ppsspp