The Infinix Hot 4 (X557) got a Nougat update recently. Those who’ve updated to the first build have complained of bugs as expected but we expect subsequent updates to fix them. The Infinix Zero 3 (X552) also just received an OTA update, though not Nougat but one its users hope is one step closer to a Nougat update; the X552-H952A1-M-170426V52 build.
As you can see, this update is still a Marshmallow Build Number and is 528.22 MB in size. The Infinix Zero 3 LTE has also received an update from XOS v2.0.0 to XOS Chameleon v2.2.0
How to update Infinix Zero 3 (X552) to the latest Build
I would also advise you do a Miracle Box dump of your Infinix Zero 3 just incase you run into problems with the update. You first need to ensure your phone isn’t rooted. If it is then unroot your Infinix Zero 3 X552. Once these are done then head to Settings > About > System Update and search for an update. If you get a message saying your version is the latest then you’ll need to exercise some patience or look for an SP Flash Tool flashable format of this update