It is now possible to downgrade a 2.71 TA-082(your motherboard).
Go here:
http://dax.st/
download Homebrew enabler for 2.71 Rev D.
Follow the readme to get it working on your psp.
When you have done that, download the TA-082 Downgrader from here:
http://downgrader.lan.st/
Follow the readme to downgrade
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