spreado:

For those of us who didn't get OTA update of Android N stable version, this the link of android N stable version

https://share.weiyun.com/77e79b6e0a8d470cfde90de0543fcdc0

Its the Tcard version, so for those who are still on android M, before you update make sure your build number is X556-H371A-M-170925V170

While those who are already on any of the beta version of the Android N, just download the file and update...

You'll get instructions here:
http://bbs.infinixmobility.com/forum.php?mod=viewthread&extra=page%3D1&tid=214980

PS: If you're using your phone, use Google Chrome and set it to desktop view or else you wont see the download link, any mobile browser you using to open the link, make sure its set to Desktop View