The only way to do a slim/lite PSP so you can play ISO/CSO backup's is by using pandora as said by jaffa.
if you know anybody with a FAT custom firmware enabled PSP then you can use that to make the pandora battery and memory card and then use them to install custom firmware on the slim PSP.
any messing around with the flash can cause it to brick, but thats why we have pandora, pandora not only installs custom firmware....it can also be used to unbrick bricked PSP's
if you follow things correctly though nothing should go wrong.
you cant downgrade a slim PSP as they will not run on firmware 1.50.
this method was used on FAT psp's with firmware 3.50 or below.
the reason for this was that the custom firmware upgraders are HOMEBREW apps and in order to use them the PSP must be running firmware 1.50 first.
the downgraders to get you to 1.5 are also HOMEBREW apps.
the clever guys that make this possible find flaws in the original firmware which will allow you to run HEN (homebrew enabled psp) which allows a certain amount of HOMEBREW to be used, so you can downgrade to 1.50.
as with original firmware....custom firmware will need to be updated as games require higher firmware versions, but this is just as easy as updating the original firmware.
so you have 2 choices
1: find a FAT psp with custom firmware so you can create the pandora battery and memory stick.
2: buy a datel battery:
http://www.gameseek.co.uk/pd/PSPaunh...grade-your-PSP (which is already made pandora) and use PSP grader to create the memory
stick.
this guide for PSP GRADER was written by JTH. i hope he dont mind me posting it here.
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REQUIREMENTS
A) PSP SLIM (PSP 2000) OR PSP FAT (PSP 1000) AND PSP USB CABLE.
[NOTE: A CARD READER CAN ALSO BE USED IN PLACE OF USB CABLE]
B) PANDORA'S BATTERY
C) MEMORY STICK PRO DUO [64MB - 4GB] I HAVE TESTED THIS AND CAN CONFIRM THAT IT WORKS WITH FAKE STICKS.
D)PSP GRADER
E)get the OFFICIAL FW UPDATES 1.5, 3.90
(both PSP grader and official 1.5/3.90 updates can be found here:
http://www.pspmod.com/forums/firmwar...er-v0-2-a.html
F) MS NET FRAMEWORK 2.0 INSTALLED ON YOUR PC.
1)INSTALL PSP GRADER TO YOUR PC
2)RUN PSP GRADER, YOU WILL SEE 2 BOXES AT THE TOP, ADD THE LOCATION TO YOUR OFFICIAL FW UPDATES 1.50 AND 3.90 INTO THE CORRESPONDING BOXES
3) PLUG YOUR PSP INTO THE PC VIA THE USB CABLE ENSURING THAT THE MEMORY STICK PRO DUO IS INSERTED INTO THE PSP. ALSO BE AWARE THAT THIS IS GOING TO FORMAT YOUR MEMORY STICK SO MAKE SURE TO BACK UP ANY IMPORTANT FILES FIRST. THE PSP GRADER PROGRAM WILL FIND YOUR PSP AND ASK IF IT IS THE DRIVE YOU WISH TO FORMAT, SELECT YES. NOW IN THE BOTTOM RIGHT CORNER OF THE PSP GRADER PROGRAM SELECT START.
4) YOUR MEMORY STICK IS NOW READY, UNPLUG THE PSP FROM THE USB CABLE, REMOVE THE BATTERY AND INSERT THE PANDORA'S BATTERY WHILST HOLDING THE LEFT SHOULDER BUTTON ON THE PSP. ONCE THE IPL HAS LOADED ON THE PSP SIMPLY PRESS THE X BUTTON. WAIT. AFTER AROUND 1 - 3 MINUTES THE FLASH SHALL BE DONE, PRESS X TO SHUTDOWN THE PSP, IT IS NOW SAFE TO REMOVE THE PANDORA BATTERY. [NOTE] ITS IS VERY IMPORTANT TO JUST WAIT AND NOT SWITCH OFF THE PSP OR REMOVE THE MEMORY STICK OR PANDORA'S BATTERY, IT COULD RESULT IN A BRICK IF YOU DO NOT WAIT.
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