Apple today seeded a second release candidate version of iPadOS 15.1 to developers for testing purposes, with the update coming just a few days released the first RC. This RC is only available to those who have an iPad mini 6, and there is no accompanying iOS 15.1 RC 2.
Registered developers can download the iPadOS 15 RC from the Apple Developer Center, and once the profile is installed, beta updates will be available over the air.
The release candidate version of iPadOS 15.1 is are the versions that will be provided to the public when iPadOS 15.1 sees an official release next week.
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And secondly there are devices which come preinstalled with iOS/iPadOS 15 or you must have forgotten about that as well
Build number for RC2 is 19B75. (up from 19B74 for RC1)