Excessive appeal viability is diluted by a plea and if you weren't sentenced to the maximum, however you should consult an experienced appeals attorney to pursue the matter.
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Did you serve a Notice of Appeal within 30 days of your conviction? If you served your time what are you appealing about? Are you on Post Release Supervision? If you agreed to this sentence I see little to zero chance on winning an appeal.
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It doesn' seem likely that you could appeal at this time. The time for appeal is right after the sentencing. Also you pled guilty so I'm not sure what your grounds for appeal would be. I'm sorry to say that I doubt that you can do anything now about it.
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