How can i to change version of the Y to G ?

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2016-08-26 23:23

I have a smartphone Meizu M2 mini, this smartphone had 4.6.xxxa version and upgrade to version 5.1.7Y. I did not read the disadvantages to upgrade to this version.
The downside is, you do not have the Spanish language. Only Chinese and English.
Try installing the version 5.1.6G but said "Corrupted firmware".

  How  can i to change version 5.1.7Y to version 5.1.8G?