While it sounds like an error, in Thor2 , this often indicates the emergency payload was successfully sent, and you can now proceed to flash the main firmware.
Before attempting to flash emergency files, ensure you have the following: i lumia 650 emergency files better
This feature does not require raw .ede files. Instead, it leverages a signed engineering SBL from the Lumia 950 to force the 650 into an emergency download state. While it sounds like an error, in Thor2