Wait for the application to scan your phone, then click on Install Software. Note that the Operating system version on the server is lower than that on the phone.
Like I said before, backup your data before you proceed. In my experience only data stored on the phone was affected. The recovery process didn’t affect my microSD card
Sit back and wait for the download to complete after which the installation will start automatically and your Lumia screen will go red with an installation progress bar
Once installation is complete, your Lumia phone screen will flash green and restart. I recommend you leave the phone plugged in till the restart process is over.
And that’s how you downgrade Windows 10 Technical Preview for Phones to Windows Phone 8.1.
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