I wasn’t successful at switching from 13, rather I uninstalled 13 from installed apps, dropped the site , created a new site, then bench get-app --branch version-14-beta-pre-release erpnext and bench --site <new sitename> install-app erpnext,
https://discuss.frappe.io/t/switch-to-branch-14/85803/7
what does bench version report now?