There is not really enough information here to fully answer this question. A lot will depend on what evidence was preserved from your original case, and if there was any DNA evidence involved or available from the original case. Hire a good appeals lawyer. Good Luck.
This is neither a felony nor misdemeanor, it is an administrative civil penalty. It will show on your driving record, but is not a criminal offense. Within day days of receiving this .02 violation, you can challenge it by requesting a hearing at the DMV Bureau of Administrative Review. Should you need more information, please feel free to call me. 321-332-6864. More information is also available on my websites.
In most cases you will be allowed to keep necessary medical appointments, however, you cannot just go. The Judge should have been told about these appointments and health issues when you were put on house arrest. You need to speak with your supervisor and get permission in advance to go. If you just go, you will likely be arrested and kept in jail. Call your attorney for help if you need it or get an attorney if you do not have one. Good Luck.
If you are asking can the State of Florida use a 20 year old DUI to enhance a new one to a felony, they can. Hoever, an experienced DUI attorney may be able to keep this evidence out. There are certain requirements that must be met regarding the former conviction before the State can use it to enhance. It would be best for your friend to speak with an experienced DUI attorney who can review the facts of his case. Good Luck
An experienced attorney can often negotiate with the prosecutor to avoid harsh penalties. You should speak with a local, experienced lawyer who can review all the facts of the case and assist you. Good luck.