各位好，看到有些主題討論 Lumia 1520 升級8.1後的問題，好像很多人都升級過了，請問我如何更新到8.1，謝謝。
Google 一下,先申請為 Developer 就可以了
參考來源
http://www.wpcentral.com/windows-phone-81-now-available，不過不要用他的 QR 碼, 申請完後到 Developer 網站的 OS Preview for Developer 寫得很清楚
Sign up to be a Windows Phone developer at appstudio.windowsphone.com for free using the Microsoft account associated with your phone.
Get the Preview for Developers app from the Windows Phone Store (QR code below).
Run the app and sign in with your Microsoft account.
Check for updates (Settings > Phone update > Check for updates) and download/install any that are available. You’ll have an update to download and install before Windows Phone 8.1 shows up if you’re downloading the Preview for Developers program for the first time.
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