Can you access via SSH?
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You can follow below two steps as well to change the root password and try to login .
1.If you have integrated host with active directory, login using AD user via ssh and then change root password.
2.If host is already managed by vcenter then you can extract the host profile from host and edit the profile to change the setting of password to "fixed password configuration" and enter new password.
then apply the host profile to the host , this will change the root password.
Thanks to all.
I'll try in the next days