Windows 10 Mobile Insider Preview Build 15240 Available for Download

UPDATED on Aug 09, 2017: Release of Windows 10 Insider Preview build 15240 for mobiles.

NOTE: These are testing builds of Windows 10 Mobile Insider Preview officially released by Microsoft. These builds are under development and testing phase and may contain bugs, issues and other problems. They may also make your phone not bootable in some rare situations. So install and use these builds at your own risk. If something goes wrong, you can try to repair your phone by restoring default firmware using Windows Phone Recovery Tool.

If you are using Windows 10 Insider Preview (previously known as Technical Preview) for mobile phones, here is a good news for you. Microsoft has released a new build 15240 of Windows 10 Insider Preview for mobile phones. This build comes with fixes for many issues which we'll discuss later in this topic.

What's New and Fixed in This Build?

Following are the new features, improvements and fixes in this new build:

  • Support for the latest Unicode updates – including new snacks, actions, dinosaurs and even fantasy characters like genies, fairies and zombies.
  • Fixed the issue where trying to update Windows Store apps saved to your SD card resulted in an 8007000B error. Apps installed on SD cards should update without any issue.
  • Fixed an issue where there was no icon shown for Windows Update for either new notifications or on the settings page under Settings > System > Notifications & actions.

Known Issues in This Build

Following are the known issues in this new build:

  • Occasionally, Narrator speaks phrases in English rather than the chosen non-English language.
  • There is a problem with the HP Elite X3 with wired docks where the portrait orientation setting is lost when the external display is disconnected and reconnected. A workaround for this is to reboot the phone after tapping the "OK" button instead of disconnecting and reconnecting. This workaround must be performed every time you connect to an external display you want to use with Continuum in portrait orientation.
  • When installing or updating a Windows Store app, you may see error 80070057. As a workaround, you can get the latest app by uninstalling the older version of the app from your device and reinstall latest version from Store.

List of Supported Mobile Phones

At the moment you can install Windows 10 Insider Preview build in following mobile phones only:

  • HP Elite x3
  • Microsoft Lumia 550
  • Microsoft Lumia 640/640XL
  • Microsoft Lumia 650
  • Microsoft Lumia 950/950 XL
  • Alcatel IDOL 4S
  • Alcatel OneTouch Fierce XL
  • SoftBank 503LV
  • VAIO Phone Biz
  • MouseComputer MADOSMA Q601
  • Trinity NuAns NEO

Some mobile phones are still not supported in this build. But Microsoft is working hard to make Windows 10 Insider Preview build to support all the remaining Lumia and non-Lumia phones.

How to Update or Install This New Build?

If you are already using Windows 10 Insider Preview in your phone, you can update to this new build by following these simple steps:

  • Open Settings app and go to Update & Recovery
  • Now open Phone Update and then tap on Check for Updates option

Now it'll automatically check for new updates and will install the new build in your mobile phone.

Please note that this new build is only available on Fast ring. If you want to change from Fast ring to Slow ring or vice versa, open Windows Insider app in your phone, login with your Microsoft account and then change ring settings.

If you are not using Windows 10 Insider Preview in your phone but want to try the new build, you can install it in your phone with the help of following tutorial:

Download Windows 10 Insider (Technical) Preview for Mobile Phones

Windows Phone users who are using the Insider Preview build, must install this new update build to experience the new features and more stability...


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  • Hello Can any kind soul Extract the latest version of Segoe UI Symbol.ttf from this Mobile Technical Preview build & post here

    Thanks in advance

  • Hey VG those who are not using lumia phones are they not able to test win 10 is it true ?

  • Hello ,
    I have a Nokia Lumia 930 but there is no update in my device , and i am in the fast ring . Any idea ?

  • Windows 10 RTM build 10240 has been released. TH1 Professional 10240.

  • dear

    windows 10 supported in lumia 535 dous?

    if supported how to install??/

    please help

  • "Users were unable to unlock their phone after entering the PIN and it kept letting them type even though they entered the pin correctly." Still having this problem on lumia 525.. Please help me to unlock my phone.

  • size of this build? taking to much time to download have a net speed of around 60kbps :P

    any ideass

  • Hello,

    just upgraded to Win10 on Microsoft Lumia 640 Dual, and I can't unlock phone:(

  • cant unlock my phone even after entering my pin nothing happens

  • navigation bar is too big, it should be reverted to the same size as the windows 8.1

  • "Users were unable to unlock their phone after entering the PIN and it kept letting them type even though they entered the pin correctly." I also had this issue, could log in after booting without sd- and simcard (Lumia 630)

  • My lumia 820 is not booting, after i tried to install windows insider

  • calls+sms filter is not working any ideas

    thanks in advance

  • Still notifications for incoming text messages weren’t appearing.

  • My Lumia 635 on fat ring is not downloading it. It keeps teling me that Developer enhancements are available. It installs that and reboots but it never seems to see 10512, I am still on the prior version and it still wants to download the developer enhancements again.

  • I'm getting a windows boot manager screen as if my phone was a desk top computer, and it says insert disk, when I can because its a phone. And it keeps looping, I NEED HELP ASAP IM DEPLOYED AND THIS IS MY ONLY DEVICE I HAVE IN POSSESSION TO KEEP IN TOUCH WITH MY FAMILY.

  • I cannot bring my sim card to work, it says: Lumie 640 LTE says: no Sim Card,
    Start screen, on the Phone tile: Pin is required
    but where i type it in? Version before a Dialog comes with enter Pin, but now i miss this.
    Please help

  • this is the Problem before is with new build 10536

  • Gerhard? same on 640 lte, no window with sim pin, how to unlock it?

  • if remove sim pin in settings, phone will find network. Try it

  • When i was installing this updated(almost complete), battery charge went down. When i tried again by connecting to a charger it loads the installation screen for like 5 mins and mobile keeps restarting. Using Lumia 520. Any know fixes?

  • i cant install xap files in my 630 no option install local apps plz hlp any solutions ????

  • if i m using windows 10 technical preview on my phone , will i get windows 10 original update.

  • hi i isntalled windows 10 on my phone but battery was down and the mobile got off, not my mobile doesnt even charge and it does not power on.. am using lumia 525 please help

  • am using windows 10 build 10536 in lumia 535
    i want goback to windows 8.1
    but windows recovery tool is not working

    can anybody tell me please
    How to roll back from Windows 10 Mobile preview to Windows Phone 8.1

  • The latest windows phone 10 built 10549 is keep on showing downloading at 9% for more than 2 hrs..have anyone experiencing similar problem...??
    What is that normal time for downloading of the built..???
    I am not able to stop the download also...
    Help please..

  • Any one gets problem with the latest build? I have to reset my phone (Lumia 920) 4 times 'cause of hanging

  • works perfect in my lumia 720 except some lags waiting for orginal update....

  • i need help to get back to 8.1 on my lumia 830 i have the preview 10536 that is making all kinds of problems and i can not recover 8.1 with the device recovery tool i just say action canceled and will not work when i try

  • (something went wrong code 0×8009000f) what is the meen of this message

  • i need help to with getting back to 8.1 on my lumia 620 have save problem as johan svard, phone just keeps reseting when windows trys to put it in flashing made and windows gives up in the end with trying after a few mins

  • unable to download whatsapp & Here Drive on windows mobile 10 insider preview

  • I installed build 10572 on my Lumia 620 running Denim, and it worked fine until I restarted my device. That's when I noticed that my phone can no longer detect the SD card. I tried resetting and restarting it, but still the SD card cannot be detected. No other choice for me but to go back to Windows 8.1 Denim and wait for the final release of Windows 10 Mobile.

  • How about Mobile tethering/Internet sharing? Is it already working?

  • I installed build 10572 on my Lumia 640. It worked fine until I restarted my device.when i was restared my phone can't detect the SD card. I tried resetting and restarting it, but still the SD card cannot be detected. Any idea for this issue ? pls help me.

  • I'm trying to download the latest update for my Lumia 830 which is running the Windows Phone 10 preview, but nothing happens, the download percentage stays at 0% even if I'm on WiFi.

  • email notifications, text notifications and phone call notifications are no longer working since installing the latest build.

  • i have been having a couple of problems with my Lumia 535. 1. the my data was being chowed at a large rate even those i was using only whatsapp. 2. i wasn't able to take pictures straight from whatsapp. 3. i couldn't save whatsapp contacts to the phone. 3. i couldn't open data sense to check whats chowing my data so much. 4. when im dailing a cell number and i make an error on the first or second number, i wasn't able to just to that number and correct it, was required to clear everything and start over....hope all that is fixed on this build

  • HI!
    I can't download new build! I don't have wifi, when I try to download build percentage sty at 0% more than 1 day but my traffic show that I tried 1,5 GB of data!
    Please help me!
    What can I do?

  • After installing windows 10 insider preview my phone is stuck with black screen and is not what working.
    What can I do now?

  • Cellular network connection is still unavailable is 10586. Lumia 925, China Unicom.

  • My 640 doesn't even start after this update!

  • Hi,
    I have windows 10 tech preview build 10536 on my Xolo winQ1000 phone.
    I've updated to this new version in my Nokia 920 but the Xolo windows phone can not find any update after build 10536. Is there a way to go back win 8.1 and then install new win 10 version for Xolo windows phone?

  • I can`t see keypad on lock screen after update so I can`t unlock my phone and i can`t use it. It restarts very often, every five minutes, and now i don`t have phone because I can` use it. What to do, help please!!!

  • I have build 10536 on my Lumia 830. Why don't I get any updates on the fast ring?

  • No offence to the people (actually I don't give a continental), but complaining that this is the only phone you have and need it to work blah blah blah..... this is a developer preview, not a general public release, THERE WILL BE BUGS, you should not install previews if you cannot accept the risks??. Don't install beta updates if you don't accept the fact that there will be problems?

  • After updating Windows OS 8.1 to 10, my lumia 535 is getting often reebot...If i remove the simcard1 it is not rebooting, can u help me for this issues...what are the steps to troubleshoot for that...

  • my power button is broken and can't be fixed.. how can i screenshot my phone and turn on my phone? there should be another way to do screenshot and the other thing that have something to do with the power button

  • VG

    ^^ No. Build 14271 has been released for PC. Mobile Preview build has been updated to 14267.1004.

  • i have lumia 625h with 512mb ram, windows 10 preview build cannot deal with my previous live tile, it crashed the screen black. and the worst is i can't do sms.
    aside from that, the constant lack of ram available really kills the apps i run.
    is in this new build i can do sms again?

  • Hiiii after instaling windows 10 on lumia 535 my phone is not switching on!!!

    What should i do??? Please someone help me!!!! I have many importand documents!!!

    Please help!!!!!

  • When is the build 14283 available for PC?

  • VG

    ^^ They are releasing same builds for mobile and PC simultaneously so it should arrive soon.

  • Microsoft has released a new build 14267!?
    Change to: Microsoft has released a new build 14283

  • this update is not available for lumia 535 dual sim

    checked in insider fast & insider release preview

    pls confirm now showing 10.0.10586.164


  • not showing any update lumia 925 fast ring. I'm on 10586 and have reset the phone still nothing shows up in insider. Help?

  • I don't think 925 is really on the list, as of 17 March. I hope they will add it after.

  • Which build is last for Lumia 630 ?!?

  • Lumia 535 dual sim is not supported for this 14291 and 14295 built by mine one was accidentally updated during mid nite auto update. In this built you need to remove one SIM card in order to get mobile connection and wifi. After few hours of update, this phone was overheated and worst battery life.

    Next day rolled back to Win 8.1 because battery only last for 6 hours and the heat can burn my skin

  • Lumia 730 dual sim - after build 14291 update I have to remove one sim in order to get mobile data connection. With both sim cards in, the phone will freeze when I try to go in Cellular&Sim settings

  • Battery drain is through the roof - Lumia 640.

  • After updating win 10 14295 preview of the Nokia Lumia 730 does not set the alarm volume. nearly the alarm does not ring.
    Another problem is the high battery consumption compared to the previous preview 10,586th Any advice? Thanks
    How can eventually return to the previous preview?

  • 14295.1000 that was the worse build tested on 2016 in my phone there are many issues.
    is is not stable, the system block very often like 2 times a day requiring reboot. battery status doesn't work very well.

    the tools status at up related with the status bar is not working very well. since the last update the screen block when you try to change the status, , enable or disable 3G kill the WP application.

    Doesn't appear the last's sms message.

    many apps just doen't turn on.

    I don't perceive drain the battery.

    write what you speak is working fine.

    take a look if you loose any improvement on build 164 much more stable.

  • after new build update automaticlly connect to wifi option not working in my home i reset my phone for solving this problem..and now also that option not working..and language pack download option also not working....what i do??..plz solve this problems.

  • Dear. all,

    After the last wp10 upgrade my lumia 640 LTE does have a problem with the battery.
    Before the upgrade, i was able to use the Phone 2 days.
    now my battery is empty in 1 day!!!
    And my WiFi can i not disarm, after a while the wifi is going on..

    Please go back to the old settings!!!!

  • microsoft lumia 540 windows 10 build 14327.1000 not working wifi and mobile data and hotspot and data uses after switch off mobile

  • just update my lumia 535 on latest insider build 14327.100 only issues camera not working but using old Lumia camera app will do, double apps. hope this issues will be fixed soon.

  • Hey all you older (the phone, not you) Lumia users with the battery/heat issues... I am right there with ya. Try turning off your GPS radio (i.e., turn off location services) entirely. This *appears* to have settled my unit down, and I was having hella time even getting it to restart or charge because I had let it drain so low and get so hot. Obviously this is not a fix but it might at least get you functioning again long enough to flashback or even live with it while a fix is prepped. Please everybody having this issue log it with Feedback Hub.

  • For my 640XL this build is a serious step back in reliability and energy consuming.
    Almost any memory-demanding app just crashes on startup. This is about skype (always), edge (on heavy sites), facebook (when scrolling down to load more data) etc. I cannot even send a feedback from my phone - the app also crashes.
    Before I could live from 2 to 3 days without charging my phone. With this build I need to charge it TWO TIMES EVERY DAY! Most consuming apps are: lock screen, start and phone.
    For lock-screen I tried to switch all notifications off - but no improvement: it still eats the battery more than any other app.

    If there is no update in the next day or two - I'll have to switch back to Windows 8.1

  • BLU Win JR LTE India Version also received Windows 10 Mobile update by saturday(28-4-2016).

  • Upgraded Windows 10 on Lumia 640 XL DS but can't unlock my phone because there is no keypad exists for SIM PIN but doesn't after that..S.O.S.!!!

  • I feel the pain described here with some of these 14xxx builds. I had the battery drain issue big time, but with this current build (14361.0) it seems much better. The problem for me which has been consistent is the live tiles not being so live - with all the 14xxx builds. Mail & calendar to not perform the way they used to previously. Meaning - mail used to update the tile immediately when I did something with the message showing up on the tile. Calendar always went to the next event when it was coming up shortly. Neither works the way it used to. Anyone else see this issue?

  • why was the call recorder button, available during a phone call, removed in the latest releases?

  • I've just installed Win 10 on my BLU Win Jr Lite but cannot log into my phone.

    It asked me for my PIN which I entered repeatedly. It then said I've entered my PIN too many times and asks me to reset my device. I have done this many times but I still receive vet the message.

    I've done a hard reset but still no luck.

    Can anybody help please.

  • After this update this morning, my Lumia 1520 won't start. Only the three buttons light but the screen is blank. How do I move from here?

  • With the latest build we are no longer able to enroll devices to our MDM system.
    the Settings - Accounts - Work Access has been removed.

    Anybody know how to get it back?

  • i am using lumia 525 and i update windows 10 mobile preview when i'm update it my mobile 3G is not working i' update build 494

  • I'm a developer/tester myself, so I know that the testing processes sometimes don't detect everything we should.
    Anyway, I think that you, MS is doing a very bad job at this. After this update, my 830 is constantly rebooting, doesn't detect the SIM card, can't write anywhere (tried OneNote and Edge), the battery is consuming rapidly, and that's what I found in just 5 minutes.

    A few months ago, it was the Bluetooth incorrect detection of my Band.

    If a phone doesn't get to work as a PHONE, then it's useless. Have you ever done a Windows desktop OS build that couldn't even boot???

    You should really, really wake up, and come up with testing that really works. A nightly build with no sufficient testing is not enough, because when the user, me, wakes up in the morning and the "!#$#"$% alarm doesn't even work (it was supposed to update from 0100 to 0500, not from 0100 to 0600), and you end up having to call the office saying 'oops, I'll be late', but you can't because the #$%#$% sim card is not detected, well, then you might have ruined my day.

    Be responsible in your work.

  • after update Windows 10 Build 14926 my mobile switch off and now I could not unlock my phone please fix this problem

  • After the latest update on my lumia 535 it doesnt appear the keypad on lock screen to unlock the phone... thanks!

  • by the way the phone is dead if i cant unlock it...

  • Upgraded Windows 10 on Lumia 640 but can't unlock my phone because there is no keypad (can't enter PIN). Now I can't use my phone

  • VG

    Many people are facing No SIM card error and no keypad issues. Microsoft is aware of the issue. Check following topic:

    Hard resetting the device may fix the issue:

  • Hard reset did the trick. Found answer in first url above.

  • This build did what Build 14371 did to my laptop- brick my Start Menu and Action Center. Had to create a new account and manually migrate all my files to the new profile.
    Thankfully, a quick restore to previous build restored everything.
    Unfortunately, they didn't add the little piece of info about expiring builds as a notification before electing to update. Now, until I can actually update to this, or another build, I have to contend with that annoying pop-up about my build expiring in 10 days.
    Can I drop out of receiving Insider builds? Coz what started out as fun is becoming hell.

  • no digits to enter pin code of my phone after upgrade - lumia 640 xl

  • I have updated my lumia 1520 to windows 10. And my OS build is 10.0.10586.545, since my last update to this, I'm not able to get any update on my phone. I have been checking always.

  • Build 14955 on Lumia 950 - uh, what happened to my volume controls? I can hear with headphones and have volume adjustment for headphones when they're plugged in and when they are not plugged in I can still adjust headphone volume. Headphones attached or not, I cannot adjust regular phone volume. Weird.

  • Since the last update the Podcast app seems to pause whenever its not "on Screen" if you focus away (change app) or the phone lock screen kicks in the playback pauses...

  • After the update many a times it happen, That my device don't wake up after pressing lock key and ultimately i have restart. The phone is not able to boot if the memory card is in slot. And after this update my phone is not able to read memory card .

  • is this update compatible with lumia 928 ??

  • Stay away from this build, especially if you have a Lumia 950 (XL). It occasionally reboots, locks and reboot. This is the first horrible build I got.

  • DUAL SIM mode in Lumia 730 stopped working with this build 15007 (and 14977 too). Urgent fix needed!!

  • After latest update (15063.138) on Lumia 950 the email notifications are gone (sound, vibrate, notification center) for two gmail accounts . Only the live tile shows the new emails. The Outlook account notifications works fine. On a Lumia 735 everything is okay with the same build.

  • Имам Lumia 640. След последните две актуализации браузърът Edge постоянно забива или се изтрива страницата на която гледам видео.

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