BigSur Post installation troubleshooting

KBA: https://support.home.sophos.com/hc/en-us/articles/360051251412#h_01ESKVK1HDXFBCJ5DMP1YR7ZWC
Part 1- https://techvids.sophos.com/share/watch/MBT51RonvLNSfybMRo3xQs?autoplay=1&second=10
Part 2- https://techvids.sophos.com/share/watch/MBT51RonvLNSfybMRo3xQs?autoplay=1&second=45
Part 3 -https://techvids.sophos.com/share/watch/MBT51RonvLNSfybMRo3xQs?autoplay=1&second=90
Part 1- https://techvids.sophos.com/share/watch/MBT51RonvLNSfybMRo3xQs?autoplay=1&second=10
Part 2- https://techvids.sophos.com/share/watch/MBT51RonvLNSfybMRo3xQs?autoplay=1&second=45
Part 3 -https://techvids.sophos.com/share/watch/MBT51RonvLNSfybMRo3xQs?autoplay=1&second=90