If you’re not using an emummc you can just boot stock via hekate.
If you are using an emummc and/or want to keep the ability to do other CFW things, you can do this:
Copy SD:/atmosphere/config_templates/override_config.ini to SD:/atmosphere/config/override_config.ini, open it, uncomment the “; program_id_0=010000000000100D” line (just remove the “;”) and change it to “program_id_0=0000000000000000” or something like that.
Also uncomment “; override_any_app=true” and set it to false.
That should make it impossible to load hbmenu.