Microsoft clarifies the differences between 19H1 and 19H2

Microsoft today issued an update to Windows 10 19H1 and 19H2 to fix bugs on the release preview ring which affected a subset of devices.

The update tackled the following issues:

• We fixed an issue where on devices with LTE capability, some SIM cards from certain carriers would not work correctly.
• We fixed several issues resulting in bugchecks on some devices.

More importantly, the firm gave a clearer explanation of the differences between 19H1 and 19H2 and its throttled release process.

To offer a clarification on these releases – 19H1 and 19H2 share the same servicing content. That means they share the same Cumulative Update package. For the small subset of Windows Insiders (the 10%) in Release Preview who were given the option to install 19H2, an enablement package is downloaded from Windows Update that turns on the 19H2 feature

Or, to put it in different terms, I’ll give a small analogy you may be familiar with. The Google Chrome and Chrome OS often hide new and upcoming features behind a feature flag. Future updates then flick this flag on to enabled when this feature is ready for general launch. The idea here is the same but applied to all of Windows 10. This ‘enablement package’ described above is the equivalent of a small update which flicks all those feature flags pegged for 19H2 on for users who are on that track. That is why 19H1 and 19H2 can have the same build revision number with the same bug fixes.

Source: Microsoft