If you have a Slim that came with custom 4.05, don't even bother.
But if it you updated to 4.05...fallow this guide.
Its how to make MMS, similar to Larryjls.
there is a step on this forum, but i can explained wat u need.
1. google MMS maker (follow its instructions, it probably may tell u to download this file called 'file you need' inside that is a guide to making MMS) <--this is for magic memory stick, fake memory sticks works too, mines 4gb.
2. Make a pandora battery, either order or hardmod (very easy) i recommend doing it urself. Save money and time. For hard mod u simple just need a sharp knife to cut open the battery (I used the cut 'n' Trace method cuz mines a slim battery), this proccess can be found on google...for the slim battery once you've cracked it open, you just need to carefully cut across this line next to the number 19, thatll turn it into a pandora, and trace that line again with pencil lead, thatll transfer back to normal...opening the battery is the hardist part...
when u have to MMS and pandora, first insert MMS, then pandora, itll automatically start, select X (u will be choosing the CFW i thik its 3.71m33) wait, and your done.
This is not really descriptive so I think you should Google for more info, but i've pretty much mentioned something.
what if you only have a psp slim which came with 3.95 but upgraded it to 4.05OFW and dont have another psp with custom firmware or anything but i have a pandoras battery. So could you please link me to a guide without having to use another psp but just by having the pandora and creating a mms?