go to your psp and put it in USB mode
now..
a) goto ms0\psp\game and create a folder called update
b)inside this new folder place your eboot.pbp
c)exit usb, goto the main menu (XMB) and go along to your memory card to where it says "game"
d)press circle and then run the update
BE WARNED.... you must have atleast 75 % battery to do this and make sure you have the ac adaptor plugged in aswell, this will get you up to 2.71 at which point you can then run the generic downgrader.
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