How to revert to Windows Phone 8.1 from Windows 10 Mobile Technical Preview
WINDOWS PHONE RECOVERY TOOL INSTALLER 8.1 INSTALL
You may need to install more than one package to upgrade from Windows Phone 8.1 to Windows 10.Go to Settings -> Phone Update -> and check for updates.Open the app and select ‘Fast’ so you will download preview builds as soon as they are released.Install Windows Insider app on the phone from here.Sign-up for becoming a Windows Insider here.It is a good idea to make a backup of pictures and important files.
Important: Several downloads and restarts may occur so make sure you have charged the battery to 100%. How to install Windows 10 Mobile Technical Preview *List with phones that officially support Windows 10 Mobile: The app also gives recommendations to free up space and back up files. Then open the Upgrade Advisor app and check if your phone is eligible for the upgrade. You need to install a small app for Windows Phone 8.1 called Upgrade Advisor. You can upgrade your smartphone* to the official Windows 10 Mobile build without joining the Insider Preview program. How to install official Windows 10 Mobile update on supported phones Fortunately, Microsoft has developed a tool for reverting back to Windows Phone 8.1 which could encourage more testers to download this build. You can download the Preview on one of the supported smartphones listed above, however, this software should not be installed on your primary device as there are many glitches. Technical Preview version 1 only works on a subset of Lumia phones – Nokia Lumia 630, 635, 636, 638, 730 and Lumia 830, but more devices will be added in the next releases. The first build is very rough and unfinished but you can still experience some new features and changes. Microsoft on Thursday revealed the first pre-release version of Window 10 for phones. Tutorial: Installing Windows 10 Mobile and going back to Windows Phone 8.1
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