CmdID

CmdID / Commands / bootcfg

bootcfg default

Specifies the operating system entry to designate as the default. Windows commands reference

On Windows

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Windows

from the Windows commands reference, CC BY 4.0
bootcfg /default [/s <computer> [/u <domain>\<user> /p <password>]] [/id <osentrylinenum>]

To use the bootcfg /default command

bootcfg /default /id 2 bootcfg /default /s srvmain /u maindom\hiropln /p p@ssW23 /id 2Identify
/idSpecifies the operating system entry line number in the [operating systems] section of the Boot.ini file to which the operating system load options are added. Windows commands reference
/s <computer>Specifies the name or IP address of a remote computer (don't use backslashes). The default is the local computer.
/u <domain>\<user>Runs the command with the account permissions of the user specified by <user> or <domain>\<user>. The default is the permissions of the current logged on user on the computer issuing the command.
/p <password>Specifies the password of the user account that is specified in the /u parameter.
/id <osentrylinenum>Specifies the operating system entry line number in the [operating systems] section of the Boot.ini file to which the operating system load options are added. The first line after the [operating systems] section header is 1.
/?Displays help at the command prompt.