The company’s biggest mistake is communication. It should be more detailed or better not say anything.
The correct thing would have been to say:
"We have released the operating system update to users who had the beta installed.
Users who were not in the beta program will receive it on day X.
If there are news or problems with the implementation of the update, we will inform you."
But no, the lack of detail along with a statement indicating that it is now available, has been a wrong decision.
