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    Thread Flash RUU - signature checking... FAILED (remote: 12 signature failed)

    Hello, I tried to flash a RUU on my m8 but i am not successful currently. I bought an m8 in china, last year. My sister tried an ota update, the phone lock on bot. So i tried to flash many rom but no success, every flash failed on the last step, the " verification signature checking... " with...