help...stuck between stock & rooted

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http://androidforums.com – I was rooted but got tired of the Verizon update trying to push through. I'm currently running a custom ROM from when I rooted via Odin. Somehow I unrooted and now I'm stuck. I'm looking for 1 of 2 options. I either want to get back to root or back to stock so I can update and then reroot. My current problem is that I can't get superuser to work but I think that's because I'm not rooted. Help. (General)