OnePlus has started rolling out Android 8.0 Oreo operating system (OS) update through a closed beta programme to OnePlus 5, the company’s first flagship of 2017.

The company has released its first "Android Open" beta build for OnePlus 3 and OnePlus 3T smartphones last month and is now introducing it for OnePlus 5 that brings user interface (UI) tweaks and other useful features.

"We are super excited to announce that we are ready to kick off the 'Open Beta Program' for the OnePlus 5 today. The first 'Open Beta' build based on Android 8.0 for the OnePlus 5 is available for download now," the company wrote in a blog post on Monday.

The OS update will bring "picture-in-picture" functionality, the company's own "Parallel Apps", added notification dots and updated security patch to October.

Unlike the closed beta programme, upgrades introduced through the company's open beta channel can be availed by users and based on their experience and feedback, the company will improve the upgrades before officially rolling them out.

OnePlus 5 is powered by octa-core Qualcomm Snapdragon 835 processor. The handset houses 16MP + 20MP dual rear cameras and 16MP front shooter.

It is powered by 3300mAh battery and is available in midnight black and slate gray colour.

At the launch of its latest flagship, OnePlus 5T, the smartphone maker announced that 5T will receive the Oreo update early next year.

According to a report by Techdroider, a OnePlus 5 user has received the Android Oreo beta 2 update on his device and has found the Face Unlock feature in the settings log. According to the report, with the Oreo update, the OnePlus 5 user received "a newly redesigned notification panel, Face Unlock feature from the OnePlus 5T, PIP Mode, New Camera and Gallery interface, and a few other features."

According to a report by Android Authority, all the Google Pixel and Nexus devices are already running on Oreo in addition to OnePlus 3, 3T, and Nokia 8.  In addition, Galaxy S8, LG V30, Essential Phone are running Beta programs.