The One UI 3.0 update for the Galaxy M21 is now live, as Samsung's custom implementation of Android 11 was already sighted in India earlier this week. Given how India's by far the largest market in which this particular smartphone released, it's also an obvious choice to prioritize for the deployment of such a major software upgrade. And it's not like Samsung hasn't already shown its hand in December when it demonstrated great urgency in how it approached beta-testing One UI 3.0 for its mid-range devices.
The over-the-air package that's now rolling out is designated as release version M215FXXU2BUAC. Apart from the new feature galore that is One UI 3.0, the January 2021 security update is also part of this firmware revision.
How long until the One UI 3.0 update reaches your Galaxy M21?
If you still haven't received a notification telling you a new OTA download is available on your Galaxy M21, you can check for one anyway manually. Just go to Settings > Software update > Download and install. If that trick doesn't produce any results, your options are to wait for the rollout to reach you or flash a copy of full system images containing the new software to a compatible Galaxy M21 unit.
Our firmware archives already contain the necessary OS files for India, but this course of action is only advisable for power users familiar with the risks of tinkering with their devices. The newly started rollout will likely be completed in a few weeks' time, as is usually the case with major updates for Samsung's Android mid-rangers.
