If it was submitted to the court and the judge signed off on it, then yes it is a valid divorce decree.
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If the judge signed the judgment on custody then that judgment is valid. The divorce may not have been completed if it was the type that required the parties to be separated for a year so you may want to consult your own attorney about completing the divorce. Either party can complete an Article 102 divorce.
Every situation is different and you should consult your own attorney to go over all the particular facts in your case. The answer given is only intended to provide general guidance regarding rights and responsibilities.
The withdrawal of the attorney would have no effect on a judgment of the court.
This response does not creat an attorney client relationship. In all cases, I recommend you seek a paid consultation with an attorney with expertise in this area.