write permissions in system partatition in order to use freedom

Im using Huawei Ascend G620s‎, after reseting my phone to factory settings, i tried to reinstall freedom and my root (used kingroot in order to root). when i tried using freedom i got the error: write permissions on system partition are required in order to use freedom (it worked before i reseted to factory settings). the root works fine yet i cant use freedom. pls help
thanks in advance, sorry for bad english

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