If your phone has no screen activity but is detected by your PC, follow these steps using the command prompt:
For those who successfully locate these free resources, the recovery process typically involves advanced command-line tools: Lumia Emergency files - Proto Beta Test lumia 650 emergency files free
If your Lumia 650 displays a lightning bolt and gear icon, a sad face :( , or is completely unresponsive, you need the "Emergency Files"—specifically, the Firmware Flash Files. If your phone has no screen activity but