Windows 10 21H1 (Fe) Branch Build 20133 by the end of June 2020

The featured update of this year 2020 is already out and people are eagerly waiting for the next major update i.e. Windows 10 21H1 Build 20133. Well, insiders are soon going to receive a new Windows 10 fast/slow Ring. However, Microsoft hints this might be an Iron (Fe) branch instead of what we receive as a manganese branch. Furthermore, one may access this new build version by the end of June 2020.

In a blog post on, there appears a leaked image featuring Build OS version 20133.1000. Besides, this also mentions the Build Date & time to “2020-05-19 17:40:00”, Family to “21H1 [Iron]”, and private leak under the source type.

As of now, Windows insiders receive Build OS in the form of the “mn_release branch”. The “mn” word signifies the Manganese “an element on the periodic element”. Windows 10 21H1 will appear in the form of the “Fe_release branch”, again another element from the periodic table.

It is presumed that Windows 10 21H1 will bring back the concepts of “Windows Sets“, Win32 containers, and some fine refinements on the OS. 

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