Steps to reproduce:
- Install Magento 2.1 by download
- Install custom theme by uploading it in app/design/frontend folder
- update magento, clear all caches, compile, deploy etc.
- Assign theme in backend
- Remove theme by deleting the folder again and deleting theme entry in database table “theme”
But In back-end when trying to assign the theme the error: “Unable to load theme by specified key”appears.
Anyone can help me?