Please don't call it OE - that's the name for a different custom firmware by a different author; you'll get people in trouble. It's called M33. Second, there's a link to an easy installer, which is against the TOS of PSP3D and is illegal.
Please correct.

Oh, and it does work, incase you don't trust the team. They're trustworthy and I've installed it no problem .

I've uninstalled it though, I already have a 3.51 custom firmware.

Just remember, don't mess with VSH.PRX, system_plugin_fg.rco, paf.prx, or common_gui.prx in M33. They cause problems.