To hide update notification - jigneshpshah/greycube_helpmanual GitHub Wiki
Comment the following line.
“frappe.utils.change_log.check_for_update” in frappe hook this.show_update_available(); in desk.js
https://github.com/frappe/frappe/blob/master/frappe/hooks.py#L182
https://github.com/frappe/frappe/blob/master/frappe/public/js/frappe/desk.js#L81