If he went to trial and lost, he can certainly appeal. What the outcome would be depends on the issues he has on appeal.
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If your brother has been convicted, he has the right to appeal, within certain time limits and success would be based on appealable issues preserved during trial. If he has just been charged, he needs an attorney now! He can take advantage of free-consultations--you will be limited in what can be discussed with you personally.
I read your past as saying that your brother was charged and convicted of assault, he received 30 years in prison. Your questions are: can he appeal and what would the result be?
He can probably appeal. Your post does not say how he was convicted. If by plea [he said no contest or guilty], he may not be able to appeal. The outcome is impossible to guess .
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