[mosope]

is it possible to upgrade infinix 551  to android 5

[X3non]

is it possible to upgrade infinix 551  to android 5

assuming your X551 is an original and not clone then you should be able to update from system update in settings
* goto settings > about phone > system update 
* check for and download updates there

PS: take note of the build number of your device before updating as you might need it later and don't try to update using this procedure if you already rooted the phone