First thing's first, make sure you do NOT have a TA-082 Motherboard (Look online to determine how).
After you find that out, and you have a compatible motherboard, download
Homebrew Enabler Rev. C (HEN C) and run it from the photo menu. After that, you should see a blue then green screen. If it's red or if it freezes, run it again, but if it's green/blue, it will reboot.
From there, make sure the firmware's Eboot you wish to downgrade to is named UPDATE.PBP so not to replace the existing PBP in the downgrader. Make sure your battery is at least 75% and proceed with it.
Hope this helps, I had trouble with it at first too
