1. samy saifi's Avatar
    I have Nokia Lumia 1520 and updated it to win 10 what will happen if i reset my phone will it go back to win8.1
    08-25-2017 12:49 AM
  2. xandros9's Avatar
    Moved to W10M.

    If you factory reset any Windows Phone, it stays on the last OS version it had installed. So no, it won't.

    Now if you use a tool like Windows Device Recovery Tool which wipes the phone entirely and installs a downloaded file, that is the method to revert to 8.1.
    raycpl, libra89 and kaktus1389 like this.
    08-25-2017 09:39 AM

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