What can I do about a 20 year old theft felony charge I had no prior knowledge of and was only in possession of stolen property?

I have a 20 year old theft felony in Tampa, Florida. Years back, I had talked to an attorney in Tampa who had told me at that time that he could take my case to court and have the court re-trial me, thus giving me the opportunity to reverse my adjudication with no problem. Due to some personal problems at that time, I was unable to reach out to this attorney before he retired. Since then, everyone tells me there is nothing I can do. After doing some research myself, I believe I have found some of the reasons why I had been told this could be done. So my question is: does anyone have a name of an attorney currently in practice which has had past success in taking old cases back to court and winning or at least trying? In my case I took no part in stealing anything or even had prior knowledge of the theft, but I was in possession of stolen property.