MSM8x39DownloadTool.exe is the "nuclear option" for fixing Snapdragon 410/615 devices. While it is incredibly effective at reviving dead phones, it should be used with caution and as a last resort when standard software fixes fail.

This is usually a driver issue or a bad USB cable/port. Try using a USB 2.0 port instead of USB 3.0.

Ensure you have the necessary "Runtime" libraries installed on Windows, or try running it in Compatibility Mode for Windows 7.

This is the trickiest part. Depending on the device, you might enter EDL mode by:

Msm8x39downloadtool.exe Upd -

This is usually a driver issue or a bad USB cable/port. Try using a USB 2.0 port instead of USB 3.0. msm8x39downloadtool.exe

Ensure you have the necessary "Runtime" libraries installed on Windows, or try running it in Compatibility Mode for Windows 7. MSM8x39DownloadTool

This is the trickiest part. Depending on the device, you might enter EDL mode by: you might enter EDL mode by: