yep its normal. they had it as M33 before, but its now MHU.
to play PSX games, you can make the seplugins folder, but you what you really need is popsloader.
if you need it, here it is:
Popsloader Easy Installer for 5.00 M33 v1.1 | Pops Installer, PSP Hacks - PSP Slim Hacks
Run the very easy installer, then point the program to your memorystick drive letter when asked. the drive letter should be something like E: or G:, you know what i mean. once you do that, it will do everything else for you, but you will have to enable it in the CFWEnabler recovery menu and thats all. how to access the CFWEnabler recovery menu? you simply re-run CFWEnabler and hold the R trigger.
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How many PSP's did I hack so far? (I'm a
5.50GEN-C User btw)
how many users I have helped? so many I lost count xD
(Sophomore year)
http://ultimakillz.blogspot.com/ if you seriously need a place with all the links you need for hacking : D