In the United States, there is a policy of a person being innocent until they are proven guilty. Even after guilt has been proven in the court of law, a person is guaranteed a second chance at being judged innocent. This is to ensure that if someone is unfairly sentenced because of trouble with a lawyer or problems with a judge or jury, they will have a second chance.
During an appeal, a person has a chance to use a different lawyer, present new evidence, or ask for old evidence to be removed from the case. In order to get the most out of your time in front of a federal appeals court, it is a good idea to have professionals prepare your new defense and explain why there should be a change in your sentence. This will make it more likely that your appeal is successful.