In a thread on its official online forum, OnePlus revealed that it has started to roll out the OxygenOS 2.2.1 update to the OnePlus X.

The rollout of the operating system update will be incremental, so OnePlus X users from different parts of the world will be receiving the upgrade at different times.

According to the post announcing the update for the OnePlus X, there are several changes coming to the operating system with the arrival of OxygenOS 2.2.1. Here are the things that users can expect from the update:

- A fix for data leak issues while roaming in certain regions

- A fix for the smartphone's microphone being muted while using Google Hangouts

- A fix for the app drawer not launching when the Google Search bar is hidden

- An upgrade to Google Mobile Services 3.0

- An update to the APN to support the carrier Tigo

- A security patch update

- General bug fixes and optimizations

Most notable about the update, however, is that it still does not include the upgrade to Android 6.0 Marshmallow. A good amount of users have posted on the thread to voice their disappointment on the delay of the rollout of Google's latest version of its mobile operating system to the OnePlus X.

Users have added that the fix does not solve some issues that they are facing, including a bug on sorting contacts, random vibrations during calls and playback lagging issues on YouTube.

Last month, OnePlus released OxygenOS 2.2.1 to the OnePlus 2, which is the latest flagship smartphone of the company. The main attraction of the update for the smartphone is that it added support for RAW photos, which guarantees better pictures taken by the device.

In addition to the inclusion of RAW support, the update also added the usual security and updates and bug fixes, though it also did not include Android 6.0 Marshmallow for the OnePlus 2.