I replaced the original battery with a cheap high capacity battery from ebay. When I turned the phone back on it said 'searching..' in the top corner and the sim card wouldn't work. I read on a website that changing batteries can do this, so I changed the batteries back and the phone requires a factory reset. When I try to restore the phone it gets about halfway through the restoration process before an error message comes up and says 'unknown error (-1)'. I have tried restoring the phone 5 times but it keeps happening, can anyone please explain the problem?
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