Is it possible that the phone is not able to boot (even with JIG) and can't be discovered by computer, because of broken "bios" battery? I'm just an amateur but for me it looks like there is some kind of leak. In Samsung service center they told me that my mobo needs to be changed, but I don't belive them and I'm not gonna pay $350 because they are to lazy and money hungry to check what is really wrong with my phone.
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