Could you be a little more specific? Do you have 2.71 SE-B installed yet, or are you still on 1.5. Either way, you should use the installer if you can't get it. If you are on 2.71 SE-A, choose the upgrade option. If you are upgrading from 1.5, then choose the second option. Also, if you are on 2.71 SE-B, choose the last option, it will install all the necessary files for the recovery back to 1.5 if you semi-brick.
Here is the link to the installer.
http://www.psp-hacks.com/download.php?id=867
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