Assuming you already appeared in court and entered the guilty plea, it may be difficult to change your plea at this point. Unfortunately, it is not up to you whether you change your plea -- you would need to move to withdraw your plea in the court where it was entered, and preferably before the judge who sentenced you. The court would need to find that your plea was not "knowing, intelligent, or voluntary" to vacate the plea. In other words, the burden would be on you and your lawyer to show...
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