If my brother has not reported to probation in 11 years, how likely is it to resolve the situation with no jail time?

Is this a serious question? On first blush, he is highly likely to go to prison. There are some circumstances that could make that not happen depending on why he quit reporting; what he has been doing with his life in the interim; the type of case for which he was on probation; etc. He enhances his chances of a lighter sentence by turning himself in (after hiring a lawyer.)