M33xEver by Red Squirrel
http://redsquirrel.forumitalian.com
http://redsquirrel.pspgen.com
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What's it?
It's a simple VSH plugin that sets the date of your PSP to 02/04 every time you boot the console!
In this way you can maintain waves and system info of the M33 "birthday surprise" (but only in CF3.90M33-3). 

How to install
Copy the SEPLUGINS folder in the ROOT of Memory Stick and activate the plugin from Recovery Men.

Thanks
To all people that ask me it.
To Adrahil for timelib.
To my girlfriend for her patience.
And naturally to D.A. for "M33 birthday surprise"...