MacOS Big Sur build 20A5299w

macOS Big Sur build 20A5299w is a build of macOS Big Sur, which shipped with the first batch of the Apple silicon-based Developer Transition Kits in late June 2020.

Like in build 20A4299v, the internal version number is still 10.16.

This is the first build of macOS Big Sur to support running iOS apps. This is also the first build of macOS Big Sur use iBoot to boot the system.