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8.10.12359.845 is the WP8.1 Build. The installation experience & how to update for newbies


The device, I am using for getting Windows Phone 8.1 developers preview update is Lumia 525 and in case you are not familiar with what is developers preview update here is our step by step guide to updating your device to Windows Phone 8.1 much before final public release.

Coming to the installation experience, if your device is already dev preview enabled, you can check for update by going to Settings—–>Check phone update and I first received a preparatory update, which makes it easy to update to Windows Phone 8.1. That preparatory update takes almost 10-15 minutes and after that either you or if you have enabled your device, it checks for next update. My device is currently updating with Windows Phone 8.1 and it takes good 30-40 minutes in installing completely. Remember,

  • There should be enough battery or plug-in your device
  • Better to be on WiFi
  • No data is lost, so not to worry on that front



Nayan has more than 10 years of experience of covering Technology and innovations. He is a big Nokia fan and Tech disruptions aficionado. He loves to review new cool gadgets and writing about Android, iOS, Gadgets and general Technology stuff. He has been associated with other well-known Tech sites WinCentral and GadgetOx since long.

He currently sports a Lumia 950 XL and Nexus 5X. Other interests include listening to Nu-Metal Hits and Kick-Boxing.
Write to him at Email: [email protected]
  • vishal

    I have no wifi so how much data is required for update my 525 lumia

  • Asad

    i m updating my lumia 720 over wifi. but after completing some amount of download. it gets cancelled. what can i do? past 2 days there is same problem. please help

    • Kamal

      Check the storage. If storage is less clear some.

  • Harshil Makwana

    When will arrives win8.1 official update for Lumia525?
    tell me date sir
    thanx advanced… 🙂

  • Abdul Aziz

    I’m not able to use 3G to update. Please help

    • Kamal

      If you are on WP8 then you can’t update over 3G, afaik.

  • eric

    Can i use 3g for update my nokia lumia 525 .bcoz i don’t have wifi . Plz help me i wanna update my lumia …

    • Kamal

      Yes, you can use 3G to update 🙂

  • namit

    hoe can i do it

  • Eric

    i hv lumia 525, i updated the preparatory software but cannot get 8.1 update. it says error 80072ee7. pls help.

  • meenakshi

    Hey i have 520 bt i am not getting any update of wp8.1 on my device plz send me the solutions here or on email me on [email protected]

  • Hello Kamal,
    On your device (Lumia 525) – is there any battery draining problem ? Somebody’s saying battery won’t stay – 35% draining per hour – if it’s true then we should wait for the official update.

  • Jerick

    had to update thrice to have WP8.1…

    • Kamal

      It is worth though!

  • Gunjan

    Using it in my Lumia 720 , its fantastic, cortana working awesome, word flow keyboard work really well. Everything is amazing in this new update, give it a try

  • jayaraman

    yo boss i install windows 8.1 but i didnt syc with facebook contact wt can i do:(

  • Rohan

    I got the update and installed it on my lumia 620 but still it is windows phone 8.. What can i do??

  • prabhu j

    just got lumia 525..two weeks gone,,,, checked for updates

    it says no updates for ur phone now

  • Akshay

    After updating from developer will it void my warranty n can i get offical updates of firmware???

  • mrp59

    i have lumia 525, i do exactly what you said but after update, i get windows 8.0.10531.166
    how can i get windows 8.1

    • Kamal

      check for update once again and you should get a new update prompt. That will be 8.1.

      • mrp59

        thank you. it worked 🙂

        • Kamal

          welcome 🙂

  • Bhoomiraj

    Is there any pblm arising after updating on lumia 520.Will i be able to get an official update for all in my phone after installing the dev preview app

    • Kamal

      Yes, you would be able to get official updates when they come.

      • Bhoomiraj

        Thanx sir

  • Nitesh

    change your language to english(us) and region to united states and then restart your phone and you will get cortana

  • Bullerd

    Done on Lumia 520



      • Kamal

        25-40- mins

  • Kalu4212

    Installed on Lumia 620 works pretty well.

  • Nokia 820

    Got 2 updates and still not wp8.1
    now phone hags at checking updates……
    I am worried ……….


    you can change your region and then it will have cortana no big deal

  • Navdeep

    Is contana available in dev preview for India??? Tmrw i ll update

  • DB

    Error 8007ee2, so no update. 🙁

    • Kamal

      Is it about server load, then you may need to wait a bit 🙂

      • Bhoomiraj

        please sir,tell me about dev update in 520.Will i be able to get the official update releasing for all to install in my device later?