I reall would but i have 2.6 ta-082 and i cant find a downgrader. :(
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Yes there is a downgrader.. Just update to 2.80 and downgrade from there :) (It patches it automatically)
http://www.psp-hacks.com/file/1040 <-- here it is :)
BTW update to 3.40OE afterwards then you are on the not so latest firmware (3.50OE to come)