3 Easy Steps:

1) Go to your PPSSPP directory.
2) assets > flash0 and replace the "font" folder with these.
3) Enjoy.


If you don't want to replace them forever, just
rename the "font" folder instead.

The reason we need to do this is because, for legal reasons,
PPSSPP uses its own fonts instead of Sony's PSP ones.
In order to render text better, you may want the original fonts
that PSP games were intended to be rendered in.