https://social.technet.microsoft.com/wiki/contents/articles/11341.the-windows-7-boot-process-sbsl.aspx
https://technet.microsoft.com/en-us/library/ee221031(v=ws.10).aspx
Note: There are many third-party tools if you prefer GUI for this task. EASYBCD has a free (also has a paid version), one of the popular BCD editor tools to work with dual boot systems.
Fig-1: Default is Window 8.1 and 30 seconds time-out
bcdedit.exe has a good many parameters for boot configuration tasks. Check a full list of bcdedit.exe commands with:
bcdedit.exe /?
bcdedit.exe <parameter> /?
1) Backup before you do anything
Like editing registry, you will need to backup the current configuration to avoid unexpected failures. First, create the backup directory under C:\ and run bcdedit with /export. See Fig-2.
bcdedit.exe /export c:\bcdbackup
Fig-2: Backup the BCD Store
2) Check the Current BCD settingYou can check the current bcd setting with /enum and /v parameters. As, you can see the default id is {d22d3d4f-c6d9-11e6-bf59-d680d7abcd65} which is Windows 8.1. We need to change this id to the windows 10's id in the next step. See Fig-3 for all OS lists in the boot menu.
bcdedit.exe /enum /v
Fig-3: Enumerate all the Boot Options
As talked, we need to change the default OS Identifier to {6aea34be-2dec-11e6-9221-9292a8212aa0} which is Windows 10. Also, we want to decrease time-out to 5 sec. Type the following commands one-by-one (replace xxxxx with your own OS id).
** Note that you may see different id for your OS, not the same one here. So, do not copy & paste these commands **
bcdedit.exe /default {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
bcdedit.exe /timeout 5
So, for my case, my Windows 10's id is {6aea34be-2dec-11e6-9221-9292a8212aa0} (check Fig-3). So, I need to type:
bcdedit /default {6aea34be-2dec-11e6-9221-9292a8212aa0}
bcdedit /timeout 5
Fig-4: Change the Default Boot OS & Time-Out Settings
4) Check your settings & Reboot (optional)Now, you can check your setting with the same command. See Fig-5.
bcdedit.exe /enum /v
Fig-5: Check the setting after changes
You can reboot now (or later) to see the results. See Fig-6.
Fig-6: Check the results
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