Dark Alex must be going for the "PSP God" title. He just released a downgrader for the cursed TA-082 motherboards, as if 2 custom firmwares in one week wasn't enough. So say good bye to your 2.71 TA-082 and say hello to 1.5, or 3.02 OE-B.
To do this, you must have a 2.71 TA-082 Motherboard with HEN-D enabled.
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Good luck, and remember that there is always a chance of bricking your PSP while flashing.