For a regular root recovery password, please refer to article: https://www.juniper.net/documentation/us/en/software/junos/user-access/topics/topic-map/recovering-root-password.html.
However, if you are unable to get the Main Menu, please refer to the solution on this document.
Device is rebooted and the only options available are:
Once on this menu, you might proceed with the regular root recover password process.