Hi Kendo2748,
unfortunatley I dont have those UMD's, I'll check where I can get them. Do you know if those game are available in the market?
All my freinds they using latest versions of OS on their PSP. No one know how to do downgrade.( As you probably know, once you buy the PSP game from the store ,it force you to run OS update on PSP, if not it does not let you play the game).
Anyway, I've checked the "
Classic Pandora's Battery Set - Tutorial / Guide [For Classic PSPs ONLY] " I'm not sure if my PSP is stands in the requirements, for instance :
Custom Firmware such as
OE, M33 or WC, ( I've copied the original text below).
I think I don't have this Custom firmware. So I'm not sure what is best for me to do.

Thank you for you help, I'm appreciating it very much.

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What is it?
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A universal PSP unbricker / downgrader by the Prometheus project, also known as Team C+D (Create & Destroy).
It´s a set consisting of a Jigkick Battery and a Magic Memory Stick which will allow you to:
Unbrick and downgrade any PSP-100* (TA-079 - TA-086) (Old "fat" PSPs).
Downgrade any PSP-100* (TA-079 - TA-086) from any SONY official firmware (i.e. 3.71) or CFW back to 1.50
Requirements
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In order to obtain one you will need the following:
A Fat PSP with a Custom Firmware such as OE, M33 or WC, or a fat PSP with the 1.5 original kernel. You can borrow your friend's, girlfriend's etc if yours is not homebrew capable yet.
A spare PSP Battery. Not all makes will work (Read the Compatibility Section bellow). Using a spare is best, as it will not be possible to boot the PSP in its normal state with the modified battery, although there is a "trick" if you only have one battery (Explained further down).
A spare Memory Stick Pro Duo of less than 4GB. 64MB should be enough for all the required applications.
Pandora's Battery software by the Team C+D