Spec as follows:
3600 NON X 6 core, MSI B450i Gaming Plus AC MITX, Gigabyte RX570 8gb, 16gb 2666mhz, 550gb WD BLUE sata - also have a 500gb pci-e 3.0 nvme that doesn't behave with Big Sur so resorted to using the sata... But can try using this again if needed? It used to just fail half way...