Last year, a change to the Android 11 Vendor Test Suite was spotted, indicating that phones launching with Android 11 and later would be required to support so-called "seamless" updates. This feature allows a phone to install a system update while it's running and simply reboot into the new environment without any user-facing delay. Unfortunately, that hasn't panned out. According to the latest Android 11 Compatibility Definition Document (CDD), Google has seemingly walked back that requirement, and we can confirm that the Samsung Galaxy S21 doesn't support seamless updates.
Read More