OxygenOS 2.2.1 starts to roll out for the OnePlus X
OxygenOS 2.2.1 rolls out to the OnePlus X
Last month, the OnePlus 2received an update to OxygenOS 2.2.1. The update didn't bring Android 6.0, but did carry RAW photography support. Today, OxygenOS 2.2.1 has started rolling out to OnePlus' form over function model, the OnePlus X. Again, no Marshmallow appears on the update, not even a little taste.
The update is being sent out OTA in waves; if you don't get it today, don't pout. Eventually, you will get the update. And you can manually check to see if it has arrived on your phone by going to the Settings on your OnePlus X.
source: OnePlusforums via AndroidCentral
Things that are NOT allowed: