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I bought an iPhone that had no power when the charger was unplugged. I’ve replaced the battery and the phone works under it’s own battery power. But whenever I go to restore the phone, iTunes detects it and allows me to click restore but when it restarts the phone it won’t connect back to iTunes. Any ideas? I’ve already replaced the Lightning connector, Just in case.
Have you tried with a different lightening cable? Was the replacement battery and charge port of original Apple quality? Does iTunes throw up any error codes?