Q: How can i prove my friend has been wrongly convicted of murder
A: Hire a good appellate lawyer
That's kind of like asking how you can perform a heart transplant on your friend. It takes lots of training and experience to do what you're asking about; the answer depends on the specifics of the case; there's no way to give you a complete answer on a site like this; and you may make things even worse by trying to do it without the proper preparation and resources.
There are programs like the Innocence Project, where law students try to get wrongful convictions overturned, but they only take a very small percentage of the cases submitted.
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