Can I downgrade?

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http://androidforums.com – So I accepted the OTA a few days ago because I wasn't really considering rooting and unlocking my phone. I decided to try and root for the first time on my old GS2 and I was successful. So now that I did that I want to do it for my Note 2 but now I can't unlock the bootloader since I'm now at VRALL4. Is there a way to downgrade to VRALJB and unlock the bootloader from there? Thanks. (General)