CAUTION : Developers Only - Not for Production sites.
If you want to change the structure of an entity type (Example : make non translatable entity to a translatable) and your entity has data, you can try the following steps.
CAUTION :
You must structure the entity before starting the developments.
This type of operations must not produce on production sites.
1. Cleanup the backup data table. drush upe --clean
2. Update Entities basic way.
This method is does not work if any of the entity contains data. drush upe --basic
This method is generate an error if can't use the basic method (But recommended to try before --all method). drush upe --basic --force