Good News for those using Infinix Hot Note X551 and running the latest Android 5.1 Lollipop.
INFINIX HOT NOTE X551 LOLLIPOP 5.1 UPDATE

Today Infinix rolled out another update for those already on 5.1 LOLLIPOP. You need to be on 5.I Lollipop to get this update.

HOW TO UPDATE YOUR INFINIX HOT X551.

If you’re rooted. Please UNROOT your device.
If you have Custom Recovery installed, please install the stock recovery.

After doing this.
Follow the guide below.
Goto your phone and open the system update make sure you’re connected to the Internet.
Download the update….
And install.

Am updating mine presently. Will tell you how it goes.
CREDIT: To Ayoproxy