Earlier, xclub launched a lollipop update for the zero2.you will
notice infinix hot notes has many updates this is just due to
some bugs they are still fixing on it.But this morning, am happy
to announce to you that zero 2 now has the final update.

How can I update the final version
There is no OTA update for zero2 you need to flash it
manually.
==>Download Spflash tools http://forum.xda-developers.com/showthread.php?t=2650125
==>Download the final update http:///1LM0Fww
Check here for setting up spflash tools
==>Make sure USB debugging is enabled to enable this go to
phone setting>>build number>>continue tapping of it till you
receive this message"you are now a developer"
==>Go to developer then enable USB debugging.
==>Unzip the downloaded update then move all into a new
folder.
==>Launch your Spflash tools load scatter files then choose
mtkscatter from the folder you created earlier.
==>Now at the top choose firmware update then click
download
==>power off your phone then plug in your USB cord the
flashing should start.
That's all you have just updated your zero 2 to the final lollipop
version.If you have any issues don't hesitate to drop your
problem through the comment box.

http://www.techfashy.com/2015/11/infinix-zero2-final-lollipop-update-now-avaliable.html?m=1