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Invalid mmi code

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Last Modified: 2017-04-11
I have the HTC One m8 phone. Every time I try to type in a code on my dialer it always shows, (invalid mmi code). I've tried several ways but I still can't get it to work. I was trying to enter secret codes for htc, as an example. Does anyone have a solution to this. And I don't have a PC
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