Requiments:
1-Fimrware Gionee_S_Plus_0204_T6075;
2-Stock Recovery;
2-Non rooted firmware.
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Tutorial: [In download link]
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Download Update : Here [pdf tutorial included]
Gionee SPlus Marshmallow Update [Official] 2016
Sir I downloaded the zip file from the link and when I choose update package and click on the downloaded zip file nothing happens and it comes on the system updater app and there is no such dialog box as shown in pic3 . please help me to update my mobile
Try again sir,It works.