use putty as a SSH logger user name as root but can't get access

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1

I updated the software to Debian 9.1 2017-08-31 4GB SD LXQT I tried to log on the system as usual as a root identity how ever it hint me wrong password, according to my knowledge, there is no passwd for Debian and I didn’t set the pwd, can anyone help me.

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root login over ssh has been disabled since February

http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#i_take_full_responsibility_for_knowing_my_beagle_is_now_insecure

Regards,