Once you try to upgrade and fail, then there is no way to get it back, its called bricking, meaning the PSP is as good as a brick. Here is the site that explains it more in detail so that way you'll have the info for the future.
http://www.askdavetaylor.com/can_i_roll_back_my_sony_psp_firmware_upgrade.html
Testimonial: "then what should i do to fix this my psp?.."
Get yourself a pandora battery. then you will be able to downgrade back to whatever ver you want to. you can either buy one or if you know somone with cfw you can make one.
http://www.pspmod.com/forums/firmware/39540-ultimate-mms-maker-guide-xp-vista.html
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