Not easily. The new update replaced the old version of the OS. Even a "factory" reset will not remove the new version. You would need to back up your data, find the file to flash, use ODIN to flash that, then set the phone up again from blank and restore your information. Once all that's done, you get to tell the update notification to "shove off" until it just decides you've delayed enough and installs on its own, leaving you in the same situation.
Maybe a better option - what don't you like? Maybe we can help guide you to resolving the issues.
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