[Android crypted] How to decrypt /data the partition?

Hi. I have crypted /data I used standard options -> menu settings - > security -> crypt phone. Now, I would like to decrypt and return to the original. I don`t have the option decrypt phone, In -> security - message says only: "you have crypted" and end. I don`t tap other option. Why?

ZTE v987 android 4.2.1 brunomod 4.0. rooted.

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