Hi good morning!
Not able to reboot my mobile XS max, it says support.apple.com/iphone/restore when I plugged in to charging port.
Good morning to you, too! Have you tried following that link? If you see the Restore screen on your iPhone, iPad, or iPod touch - Apple Support
If not, please check it out. If the information does not help, there is a link at the bottom that will connect you to Apple Support.
