Kurt Shintaku's Blog

Those of you who’ve updated your Microsoft/Nokia Lumia Windows Phone to the generic build of the Developer’s Preview of Windows Phone 8.1 may want to return to Windows Phone 8. 

VERIZON WIRELESS CUSTOMERS: 
This will be the case, for instance, when your wireless carrier publishes an official release of Windows Phone 8.1 for your device – like the Lumia Icon.  You’ll need to start with WP8 to get to the official release.

To begin, you’ll need to download the “Nokia Lumia Software Recovery Tool”.  This is available here:

• DOWNLOAD: Lumia Software Recovery Tool
  http://download-fds.webapps.microsoft.com/supportFiles/phones/files/
  recovery/LumiaSoftwareRecoveryToolInstaller.exe

It’s pretty self explanatory once the tool is downloaded and installed however if needed, the remaining instructions on how to accomplish this once downloaded are documented here:

• FAQ – How can I recover/reset/restore my phone software?
  http://www.microsoft.com/en-us/mobile/support/faq/?action=singleTopic&topic=FA142987