Bcdedit -
First, identify the (a long GUID string or a name like current ) of the OS you want to set as default using the bcdedit command. Then:
bcdedit /set 5d5f9a7c-... bootlog Yes
Set timeout (seconds):
First, identify the (a long GUID string or a name like current ) of the OS you want to set as default using the bcdedit command. Then:
bcdedit /set 5d5f9a7c-... bootlog Yes
Set timeout (seconds):