I recently got a 5800x+B550 PC, using an SSD from my old laptop with Windows 1903. It's running stable but has a problem to get Windows 10 update: every time when I ran update, no error is reported, but when reboot, it will get into a state that it will ask for the keyboard layout, and then will ask whether you want to exit and continue to boot into the Windows, or choose another OS to boot, etc. If you select choose another OS, you will see there were 2 entries that can be selected from, one is the Current Windows, and the other one with no name, but if you select it, the machine will still go into the Windows. But no matter which one you choose, once logged in to Windows and check, you will find the Windows is still at the original 1903 level.