it seems ookm is close to acheiving something that most people will be happy with, preferrably those with psp's that have TA-082 motherboards read below and see what he posted on his blog, make sure to check his blog for any updates, later
About TA-082 SoftDown
encounters some difficulties in the programming
diligently to solve
Please wait :P
when "TA-082 SoftDown" Release
it can support FW2.71(Original FW2.50)
if your PSP is "Original FW2.50"
feel free update to FW2.71