1. Windows Central Question's Avatar
    Hi, I'm using AT&T Lumia 640 unlocked with other carrier. The version it has is: 8.10.15148.160.. Is it possible to install win 10?
    04-04-2016 02:34 AM
  2. Chintan Gohel's Avatar
    Hi, I'm using AT&T Lumia 640 unlocked with other carrier. The version it has is: 8.10.15148.160.. Is it possible to install win 10?
    Go to store and search for an app called upgrade advisor. Install it and use it to check for updates. It's likely there is an update for your phone
    04-04-2016 06:33 AM
  3. pankaj981's Avatar
    The AT&T version does not have WM10 yet. If you want to get it now then you will have to install windows insider >> get enrolled in slow ring >> download and install build 10586.107 >> again download and install build 10586.164.
    04-04-2016 06:51 AM
  4. Chintan Gohel's Avatar
    The AT&T version does not have WM10 yet. If you want to get it now then you will have to install windows insider >> get enrolled in slow ring >> download and install build 10586.107 >> again download and install build 10586.164.
    but he said it's unlocked, so doesn't that make a difference?
    04-04-2016 07:39 AM
  5. pankaj981's Avatar
    but he said it's unlocked, so doesn't that make a difference?
    No it does not.
    Carrier unlocked ≠ factory unlocked.
    Updates are dependent on the firmware running on the phone. Updates for a carrier variant firmware will always be controlled by the carrier regardless if the phone is unlocked or carrier locked. Updates for Country Variants (CV) firmware are controlled by the manufacturer, in this case Microsoft.

    Since the AT&T Lumia 640 is running the AT&T firmware by default all updates are dependent on AT&T's approval. If the OP flashes the firmware to an unbranded CV ROM then he will get the official WM10 update right away.
    04-04-2016 08:00 AM
  6. stocktiki's Avatar
    is there a downside to updating the phone through Insider vs. OTA - if AT&T ever gets around to it?
    04-05-2016 12:08 AM
  7. abhishek singh21's Avatar
    is there a downside to updating the phone through Insider vs. OTA
    no , both of them offer .164 build :) all you got to do is switch to production build after updating the device to .164 using insiders :)
    pankaj981 likes this.
    04-05-2016 01:02 AM
  8. pankaj981's Avatar
    is there a downside to updating the phone through Insider vs. OTA - if AT&T ever gets around to it?
    Make sure you update from the Release Preview ring. The Fast and Slow rings will give you RedStone builds
    04-05-2016 09:23 AM
  9. tpapictures's Avatar
    No it does not.
    Carrier unlocked ≠ factory unlocked....If the OP flashes the firmware to an unbranded CV ROM then he will get the official WM10 update right away.
    I'm so glad because of your help in my thread, that I know what you're talking about now with all this. :)
    04-05-2016 10:56 AM
  10. rhapdog's Avatar
    The AT&T version does not have WM10 yet. If you want to get it now then you will have to install windows insider >> get enrolled in slow ring >> download and install build 10586.107 >> again download and install build 10586.164.
    Make sure you update from the Release Preview ring. The Fast and Slow rings will give you RedStone builds
    I was just about to correct you on that one. ;)

    Definitely use the "Release Ring" of the preview, because I was on the slow ring and got the RedStone build. I'm still trying to work through a few bugs that have given me fits getting things running properly.

    .164 is an awesome build and I have found it to be more stable than the 8.1 update 2 that comes on the 640 stock.
    pankaj981 likes this.
    04-05-2016 10:58 AM

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