Facebook notes blog feed not updating
In the meantime please open your app to the activity feed and shake your phone for the send logs dialog.
My notifications area is empty as well, there was a notification and an entry remains in the activity feed that firmware updated to 229.
Once I acknowledged it in alerts it then moved to the activity feed.
This is more than likely not what you'd prefer to hear, but.
Doing factory restores at the point in the life of Core shouldn't be something anyone has to do.
I went into it again later and all my activity was back, so it could be possible that the activity feedis kept on the Norton servers.