"pops.txt"
With this line:
ms0:/seplugins/popsloader.prx
I assume "pop.txt" is a typo in your post.
Make sure the plug-in is enabled in the Recovery Menu.
Part of knowing that you have the plug-in setup correctly is by seeing it displayed in the Recovery menu.
I only bring this up because it sounds like popsloader is not active because you cannot bring up the popsloader menu by holding R after starting a game.
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