The reboot to recovery option is hidden by default.
If you want it enabled you must go to settings, developers options, and check mark Advanced Reboot.
If you don't see Developers Option in your settings, that is also hidden by default to protect newbies from hurting their phones.
The developer options gets enabled from settings, about phone, all the way down and keep tapping on Build Number seven times or more.
That should do it.
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