Windows Device Recovery Tool is only flashing 8.1 to models that did not launch with 10 so it will revert if you upgraded to W10M. You can download it from here: How can I recover/reset/restore my phone software?
Start the program and let it update if it asks to. Once it is open, connect your device to your computer via USB and your phone should be detected.
Also see this thread:
http://forums.windowscentral.com/gen...more-oems.html If you need additional help or have more questions or details to share, please join the site so you can reply in this thread. See this link for instructions on how to join Windows Central. 
