I've just complete the downgrade on my non-rooted Galaxy S3 to the previous (MB1) version. It was easy to do and my phone is back to normal. I've never been one to mess around with rooting or otherwise modifying my phones and was a little intimidated, but everything went smooth as silk.
Follow the direction on this page
This is the download link for MB1
>Links deleted. First one takes readers to a site to root their device, links to this type of site are not allowed.
2nd link VZW does not support and should not be held liable by users who brick their phone and expect VZW to fix it. So it is deleted also<
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