PSP Upgrade, Need Help

I cant load any disc on my 2.5 psp, and i wanted to upgrade to like 2.71 so i can use homebrew from the XMB of the psp. Since I cant load GTA to use the eLoader to downgrade, im stuck without anything on my psp.

Can someone give me the files to upgrade to 2.71.

http://www.psp-hacks.com/category/47
As far as i know most people use the US release.

upgrade to 2.71 SE-B"...its much better than standard 2.71 and it allows commercial games, homebrew from the 1.50 firmware to be run without devhook.