Lenovo A816 Rooting

Hello. Could anyone help me with rooting this phone? I have tried all the once click apps out there and I've tried the computer based ones too. My phone is Lenovo A816. Its in Chinese, but English language is installed. Could I put a custom rom on it too? Please help. Starting to think its impossible to root this phone. I have looked everywhere all over the internet to no avail.

Thanks.

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