Big Sur installation doesn't proceed after the second reboot. See the video

see the attached photo, it is what i see before it restarts. this is a screenshot from a video as verbose immediately restart, its harder to get a photo. Full video is at https://youtu.be/XJjsHgtEQ-E

​

https://preview.redd.it/nw3nqi3wxa461.png?width=1000&format=png&auto=webp&s=04f66788fc13a8db806aba451476db40afb8d28d