Numerous Android OEMs have released the first Android 12 Beta to their devices, following its announcement earlier this week. However, it is worth holding off installing Android 12 beta on a few devices, as there is a risk that the update could brick your handset.
https://www.notebookcheck.net/Android-12-Beta-1-rolls-out-to-multiple-over-25-smartphones-risks-with-installing-on-OnePlus-and-Xiaomi-devices.540217.0.html