How to change the default operating system entry

At the command prompt, type:

bcdedit /default ID
Option  Explanation

ID
Specifies the default GUID to be used when the time-out expires.

{466f5a88-0af2-4f76-9038-095b170dc21c} is the predefined GUID for NTLDR.

You can find the ID for a particular object by specifying bcdedit /enum all.

Examples

The following command sets the specified entry as the default boot manager

entry:

bcdedit /default {cbd971bf-b7b8-4885-951a-fa03044f5d71}