Once in recovery mode, I strongly recommend you backup user data first after which you go to Apply update from SD card and then select the update.zip file you stored in your SD card.
The update will begin immediately. It takes a while to complete though but afterwards you should be up and running XUI 1.Z.3.2. Before rebooting, I highly recommend you Wipe cache partition.
The reboot takes a while too depending on how many apps you have on your device as they all have to be optimized again.
So far, I haven’t noticed any major bug with this update and the build number changed from the regular X552-H952-B1-L to X552-H952-BF1-L.
Now considering this update was released 5 days ago, I wouldn’t be surprised if the Marshmallow release date for the Infinix Zero 3 is pushed to May, 2016.
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