We have been testing the 20H2 with the same graphics driver version for the past few weeks, with a fresh installation everything seems to be working just fine.
NEWS... Found the best solution for fixing: how to mapping SMBv1 drive in Win10 2004/20H2 1) Have to do it after 1st time finished mapping the drive in Win10, before any reboot 2) RUN "regedit" and found at location HKey_Current_User\Network\XX (XX is your drive label) 3) Add "ProviderFlags", dwords value is 0x00000001 4) After that, your mapping drive is keep working after reboot Remarks : If not adding this "ProviderFlags", your mapping drive will be failed after reboot Win10
Yes, I done, and finding this solution for a long time. (all SMBv1 NAS is not fully work in Win10 2004 or later)