MacOS Big Sur build 20A5354i

macOS Big Sur build 20A5354i is the official Beta 5 and second Public Beta build of macOS Big Sur, which was released to Apple developers on 19 August 2020. This build does not support the 27-inch iMac (Retina 5K, 27-inch, 2020). Installing on those Macs will cause an error and a reinstallation of macOS Catalina is needed. It was also released as the second public beta on 20 August 2020.